diff --git a/CHANGELOG.md b/CHANGELOG.md
index 03039ea83..1e03014b4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Fixed
 - Fixed PHP 8.4 deprecations
 ### Updated APIs
+- Updated opensearch-php APIs to reflect [opensearch-api-specification@2395cb4](https://github.com/opensearch-project/opensearch-api-specification/commit/2395cb472ec5581656aac184f7b20548cd5b06ac)
 - Updated opensearch-php APIs to reflect [opensearch-api-specification@ebe0f8a](https://github.com/opensearch-project/opensearch-api-specification/commit/ebe0f8a885f7db7e882d160c101055a5aa70a707)
 - Updated opensearch-php APIs to reflect [opensearch-api-specification@398481e](https://github.com/opensearch-project/opensearch-api-specification/commit/398481e5bd1cc590d947c35379c47096f2114f00)
 - Updated opensearch-php APIs to reflect [opensearch-api-specification@6bb1fed](https://github.com/opensearch-project/opensearch-api-specification/commit/6bb1fed0a2c7cf094a5ecfdb01f0306a4b9f8eba)
diff --git a/src/OpenSearch/Client.php b/src/OpenSearch/Client.php
index ae6cbb29a..76d27b34a 100644
--- a/src/OpenSearch/Client.php
+++ b/src/OpenSearch/Client.php
@@ -21,11 +21,9 @@
 
 namespace OpenSearch;
 
-use OpenSearch\Common\Exceptions\BadMethodCallException;
-use OpenSearch\Common\Exceptions\NoNodesAvailableException;
 use OpenSearch\Endpoints\AbstractEndpoint;
-use OpenSearch\Namespaces\NamespaceBuilderInterface;
 use OpenSearch\Namespaces\BooleanRequestWrapper;
+use OpenSearch\Namespaces\NamespaceBuilderInterface;
 use OpenSearch\Namespaces\AsyncSearchNamespace;
 use OpenSearch\Namespaces\AsynchronousSearchNamespace;
 use OpenSearch\Namespaces\CatNamespace;
@@ -59,7 +57,6 @@
 use OpenSearch\Namespaces\TasksNamespace;
 use OpenSearch\Namespaces\TransformsNamespace;
 use OpenSearch\Namespaces\WlmNamespace;
-use OpenSearch\Traits\DeprecatedPropertyTrait;
 
 /**
  * Class Client
@@ -72,6 +69,8 @@ class Client
 
     /**
      * @var Transport
+     *
+     * @deprecated in 2.3.2 and will be removed in 3.0.0.
      */
     public $transport;
 
@@ -265,7 +264,7 @@ class Client
     /**
      * Client constructor
      *
-     * @param \OpenSearch\TransportInterface|\OpenSearch\Transport $transport
+     * @param TransportInterface|Transport $transport
      * @param callable|EndpointFactoryInterface $endpointFactory
      * @param NamespaceBuilderInterface[] $registeredNamespaces
      */
@@ -726,7 +725,7 @@ public function exists(array $params = []): bool
         $endpoint->setId($id);
         $endpoint->setIndex($index);
 
-        return BooleanRequestWrapper::performRequest($endpoint, $this->transport);
+        return BooleanRequestWrapper::sendRequest($endpoint, $this->httpTransport);
     }
 
     /**
@@ -765,7 +764,7 @@ public function existsSource(array $params = []): bool
         $endpoint->setId($id);
         $endpoint->setIndex($index);
 
-        return BooleanRequestWrapper::performRequest($endpoint, $this->transport);
+        return BooleanRequestWrapper::sendRequest($endpoint, $this->httpTransport);
     }
 
     /**
@@ -1222,7 +1221,7 @@ public function ping(array $params = []): bool
         $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ping::class);
         $endpoint->setParams($params);
 
-        return BooleanRequestWrapper::performRequest($endpoint, $this->transport);
+        return BooleanRequestWrapper::sendRequest($endpoint, $this->httpTransport);
     }
 
     /**
@@ -1322,7 +1321,7 @@ public function reindex(array $params = [])
     }
 
     /**
-     * Changes the number of requests per second for a particular Reindex operation.
+     * Changes the number of requests per second for a particular reindex operation.
      *
      * $params['task_id']             = (string) Identifier for the task. (Required)
      * $params['requests_per_second'] = (number) The throttle for this request in sub-requests per second.
@@ -1408,7 +1407,6 @@ public function scriptsPainlessExecute(array $params = [])
      * $params['error_trace']            = (boolean) Whether to include the stack trace of returned errors. (Default = false)
      * $params['source']                 = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
      * $params['filter_path']            = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
-     * $params['body']                   = (array) The scroll ID if not passed by URL or query parameter.
      *
      * @param array $params Associative array of parameters
      * @return array
@@ -2040,14 +2038,14 @@ protected function getEndpointFactory(): EndpointFactoryInterface
      * Catchall for registered namespaces
      *
      * @return object
-     * @throws BadMethodCallException if the namespace cannot be found
+     * @throws \BadMethodCallException if the namespace cannot be found
      */
     public function __call(string $name, array $arguments)
     {
         if (isset($this->registeredNamespaces[$name])) {
             return $this->registeredNamespaces[$name];
         }
-        throw new BadMethodCallException("Namespace [$name] not found");
+        throw new \BadMethodCallException("Namespace [$name] not found");
     }
 
     /**
@@ -2070,9 +2068,9 @@ public function extractArgument(array &$params, string $arg)
     }
 
     /**
-     * Sends a raw request to the cluster
-     * @return array|string|null
-     * @throws \Exception
+     * Send a raw request to the cluster.
+     *
+     * @throws \Psr\Http\Client\ClientExceptionInterface
      */
     public function request(string $method, string $uri, array $attributes = []): array|string|null
     {
@@ -2084,23 +2082,19 @@ public function request(string $method, string $uri, array $attributes = []): ar
     }
 
     /**
-     * Sends a request for the given endpoint.
-     *
-     * @param \OpenSearch\Endpoints\AbstractEndpoint $endpoint
+     * Send a request for an endpoint.
      *
-     * @return array|string|null
-     *
-     * @throws \Exception
+     * @throws \Psr\Http\Client\ClientExceptionInterface
      */
     private function performRequest(AbstractEndpoint $endpoint): array|string|null
     {
-        $options = $endpoint->getOptions();
         return $this->httpTransport->sendRequest(
             $endpoint->getMethod(),
             $endpoint->getURI(),
             $endpoint->getParams(),
             $endpoint->getBody(),
-            $options['headers'] ?? []
+            $endpoint->getOptions()
         );
     }
+
 }
diff --git a/src/OpenSearch/Endpoints/AsynchronousSearch/Search.php b/src/OpenSearch/Endpoints/AsynchronousSearch/Search.php
index 1d3e4372d..c0f8bc1f9 100644
--- a/src/OpenSearch/Endpoints/AsynchronousSearch/Search.php
+++ b/src/OpenSearch/Endpoints/AsynchronousSearch/Search.php
@@ -49,7 +49,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Bulk.php b/src/OpenSearch/Endpoints/Bulk.php
index 65b2c16fe..6f01cb1f2 100644
--- a/src/OpenSearch/Endpoints/Bulk.php
+++ b/src/OpenSearch/Endpoints/Bulk.php
@@ -70,23 +70,25 @@ public function getMethod(): string
         return 'POST';
     }
 
-    public function setBody($body): static
+    public function setBody(string|iterable|null $body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
-        if (is_array($body) === true || $body instanceof Traversable) {
-            foreach ($body as $item) {
-                $this->body .= $this->serializer->serialize($item) . "\n";
+
+        if (is_string($body)) {
+            if (!str_ends_with($body, "\n")) {
+                $body .= "\n";
             }
-        } elseif (is_string($body)) {
             $this->body = $body;
-            if (substr($body, -1) != "\n") {
-                $this->body .= "\n";
-            }
-        } else {
-            throw new InvalidArgumentException("Body must be an array, traversable object or string");
+            return $this;
         }
+
+        // Must be an iterable.
+        foreach ($body as $item) {
+            $this->body .= $this->serializer->serialize($item) . "\n";
+        }
+
         return $this;
     }
 
diff --git a/src/OpenSearch/Endpoints/BulkStream.php b/src/OpenSearch/Endpoints/BulkStream.php
index daa7c7210..4759e2a01 100644
--- a/src/OpenSearch/Endpoints/BulkStream.php
+++ b/src/OpenSearch/Endpoints/BulkStream.php
@@ -66,23 +66,25 @@ public function getMethod(): string
         return 'PUT';
     }
 
-    public function setBody($body): static
+    public function setBody(string|iterable|null $body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
-        if (is_array($body) === true || $body instanceof Traversable) {
-            foreach ($body as $item) {
-                $this->body .= $this->serializer->serialize($item) . "\n";
+
+        if (is_string($body)) {
+            if (!str_ends_with($body, "\n")) {
+                $body .= "\n";
             }
-        } elseif (is_string($body)) {
             $this->body = $body;
-            if (substr($body, -1) != "\n") {
-                $this->body .= "\n";
-            }
-        } else {
-            throw new InvalidArgumentException("Body must be an array, traversable object or string");
+            return $this;
         }
+
+        // Must be an iterable.
+        foreach ($body as $item) {
+            $this->body .= $this->serializer->serialize($item) . "\n";
+        }
+
         return $this;
     }
 
diff --git a/src/OpenSearch/Endpoints/Cat/PitSegments.php b/src/OpenSearch/Endpoints/Cat/PitSegments.php
index f8aa23f85..c4646ff01 100644
--- a/src/OpenSearch/Endpoints/Cat/PitSegments.php
+++ b/src/OpenSearch/Endpoints/Cat/PitSegments.php
@@ -51,7 +51,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Cat/Templates.php b/src/OpenSearch/Endpoints/Cat/Templates.php
index 116c05f6f..563f4c494 100644
--- a/src/OpenSearch/Endpoints/Cat/Templates.php
+++ b/src/OpenSearch/Endpoints/Cat/Templates.php
@@ -65,7 +65,7 @@ public function getMethod(): string
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/ClearScroll.php b/src/OpenSearch/Endpoints/ClearScroll.php
index e00ae70ad..93ea6faf0 100644
--- a/src/OpenSearch/Endpoints/ClearScroll.php
+++ b/src/OpenSearch/Endpoints/ClearScroll.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Cluster/AllocationExplain.php b/src/OpenSearch/Endpoints/Cluster/AllocationExplain.php
index 0605f258c..c25d7f885 100644
--- a/src/OpenSearch/Endpoints/Cluster/AllocationExplain.php
+++ b/src/OpenSearch/Endpoints/Cluster/AllocationExplain.php
@@ -53,7 +53,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Cluster/DeleteComponentTemplate.php b/src/OpenSearch/Endpoints/Cluster/DeleteComponentTemplate.php
index 09dbd0567..f146f3ab4 100644
--- a/src/OpenSearch/Endpoints/Cluster/DeleteComponentTemplate.php
+++ b/src/OpenSearch/Endpoints/Cluster/DeleteComponentTemplate.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Cluster/DeleteWeightedRouting.php b/src/OpenSearch/Endpoints/Cluster/DeleteWeightedRouting.php
index a91cb5315..e98df5618 100644
--- a/src/OpenSearch/Endpoints/Cluster/DeleteWeightedRouting.php
+++ b/src/OpenSearch/Endpoints/Cluster/DeleteWeightedRouting.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Cluster/ExistsComponentTemplate.php b/src/OpenSearch/Endpoints/Cluster/ExistsComponentTemplate.php
index 84ab41734..a3daa82d7 100644
--- a/src/OpenSearch/Endpoints/Cluster/ExistsComponentTemplate.php
+++ b/src/OpenSearch/Endpoints/Cluster/ExistsComponentTemplate.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Cluster/GetComponentTemplate.php b/src/OpenSearch/Endpoints/Cluster/GetComponentTemplate.php
index 0d4905178..2c2f79b72 100644
--- a/src/OpenSearch/Endpoints/Cluster/GetComponentTemplate.php
+++ b/src/OpenSearch/Endpoints/Cluster/GetComponentTemplate.php
@@ -43,6 +43,7 @@ public function getParamWhitelist(): array
     {
         return [
             'cluster_manager_timeout',
+            'flat_settings',
             'local',
             'master_timeout',
             'pretty',
diff --git a/src/OpenSearch/Endpoints/Cluster/GetDecommissionAwareness.php b/src/OpenSearch/Endpoints/Cluster/GetDecommissionAwareness.php
index 4b0569b28..487c46624 100644
--- a/src/OpenSearch/Endpoints/Cluster/GetDecommissionAwareness.php
+++ b/src/OpenSearch/Endpoints/Cluster/GetDecommissionAwareness.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setAwarenessAttributeName($awareness_attribute_name): static
     {
-        if (isset($awareness_attribute_name) !== true) {
+        if (is_null($awareness_attribute_name)) {
             return $this;
         }
         $this->awareness_attribute_name = $awareness_attribute_name;
diff --git a/src/OpenSearch/Endpoints/Cluster/GetWeightedRouting.php b/src/OpenSearch/Endpoints/Cluster/GetWeightedRouting.php
index dd42bd43c..4252925c8 100644
--- a/src/OpenSearch/Endpoints/Cluster/GetWeightedRouting.php
+++ b/src/OpenSearch/Endpoints/Cluster/GetWeightedRouting.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setAttribute($attribute): static
     {
-        if (isset($attribute) !== true) {
+        if (is_null($attribute)) {
             return $this;
         }
         $this->attribute = $attribute;
diff --git a/src/OpenSearch/Endpoints/Cluster/PutComponentTemplate.php b/src/OpenSearch/Endpoints/Cluster/PutComponentTemplate.php
index 86a698162..3a31ac1a8 100644
--- a/src/OpenSearch/Endpoints/Cluster/PutComponentTemplate.php
+++ b/src/OpenSearch/Endpoints/Cluster/PutComponentTemplate.php
@@ -62,7 +62,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -72,7 +72,7 @@ public function setBody($body): static
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Cluster/PutDecommissionAwareness.php b/src/OpenSearch/Endpoints/Cluster/PutDecommissionAwareness.php
index 713856003..763ad48b2 100644
--- a/src/OpenSearch/Endpoints/Cluster/PutDecommissionAwareness.php
+++ b/src/OpenSearch/Endpoints/Cluster/PutDecommissionAwareness.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setAwarenessAttributeName($awareness_attribute_name): static
     {
-        if (isset($awareness_attribute_name) !== true) {
+        if (is_null($awareness_attribute_name)) {
             return $this;
         }
         $this->awareness_attribute_name = $awareness_attribute_name;
@@ -64,7 +64,7 @@ public function setAwarenessAttributeName($awareness_attribute_name): static
 
     public function setAwarenessAttributeValue($awareness_attribute_value): static
     {
-        if (isset($awareness_attribute_value) !== true) {
+        if (is_null($awareness_attribute_value)) {
             return $this;
         }
         $this->awareness_attribute_value = $awareness_attribute_value;
diff --git a/src/OpenSearch/Endpoints/Cluster/PutSettings.php b/src/OpenSearch/Endpoints/Cluster/PutSettings.php
index adc67a564..5d435ad1e 100644
--- a/src/OpenSearch/Endpoints/Cluster/PutSettings.php
+++ b/src/OpenSearch/Endpoints/Cluster/PutSettings.php
@@ -55,7 +55,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Cluster/PutWeightedRouting.php b/src/OpenSearch/Endpoints/Cluster/PutWeightedRouting.php
index 4c707f665..bdacd829c 100644
--- a/src/OpenSearch/Endpoints/Cluster/PutWeightedRouting.php
+++ b/src/OpenSearch/Endpoints/Cluster/PutWeightedRouting.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -62,7 +62,7 @@ public function setBody($body): static
 
     public function setAttribute($attribute): static
     {
-        if (isset($attribute) !== true) {
+        if (is_null($attribute)) {
             return $this;
         }
         $this->attribute = $attribute;
diff --git a/src/OpenSearch/Endpoints/Cluster/Reroute.php b/src/OpenSearch/Endpoints/Cluster/Reroute.php
index 522469177..ef6bcd283 100644
--- a/src/OpenSearch/Endpoints/Cluster/Reroute.php
+++ b/src/OpenSearch/Endpoints/Cluster/Reroute.php
@@ -58,7 +58,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Count.php b/src/OpenSearch/Endpoints/Count.php
index b83201db1..b26c4bfe1 100644
--- a/src/OpenSearch/Endpoints/Count.php
+++ b/src/OpenSearch/Endpoints/Count.php
@@ -69,7 +69,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Create.php b/src/OpenSearch/Endpoints/Create.php
index 28dac6add..ad920fcd1 100644
--- a/src/OpenSearch/Endpoints/Create.php
+++ b/src/OpenSearch/Endpoints/Create.php
@@ -71,7 +71,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/DanglingIndices/DeleteDanglingIndex.php b/src/OpenSearch/Endpoints/DanglingIndices/DeleteDanglingIndex.php
index 7e9a82c7d..36823fd29 100644
--- a/src/OpenSearch/Endpoints/DanglingIndices/DeleteDanglingIndex.php
+++ b/src/OpenSearch/Endpoints/DanglingIndices/DeleteDanglingIndex.php
@@ -62,7 +62,7 @@ public function getMethod(): string
 
     public function setIndexUuid($index_uuid): static
     {
-        if (isset($index_uuid) !== true) {
+        if (is_null($index_uuid)) {
             return $this;
         }
         $this->index_uuid = $index_uuid;
diff --git a/src/OpenSearch/Endpoints/DanglingIndices/ImportDanglingIndex.php b/src/OpenSearch/Endpoints/DanglingIndices/ImportDanglingIndex.php
index 595507962..245526638 100644
--- a/src/OpenSearch/Endpoints/DanglingIndices/ImportDanglingIndex.php
+++ b/src/OpenSearch/Endpoints/DanglingIndices/ImportDanglingIndex.php
@@ -62,7 +62,7 @@ public function getMethod(): string
 
     public function setIndexUuid($index_uuid): static
     {
-        if (isset($index_uuid) !== true) {
+        if (is_null($index_uuid)) {
             return $this;
         }
         $this->index_uuid = $index_uuid;
diff --git a/src/OpenSearch/Endpoints/DeleteByQuery.php b/src/OpenSearch/Endpoints/DeleteByQuery.php
index f01f07cf7..d97e1d427 100644
--- a/src/OpenSearch/Endpoints/DeleteByQuery.php
+++ b/src/OpenSearch/Endpoints/DeleteByQuery.php
@@ -91,7 +91,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/DeleteByQueryRethrottle.php b/src/OpenSearch/Endpoints/DeleteByQueryRethrottle.php
index 05a53021b..c2f597941 100644
--- a/src/OpenSearch/Endpoints/DeleteByQueryRethrottle.php
+++ b/src/OpenSearch/Endpoints/DeleteByQueryRethrottle.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setTaskId($task_id): static
     {
-        if (isset($task_id) !== true) {
+        if (is_null($task_id)) {
             return $this;
         }
         $this->task_id = $task_id;
diff --git a/src/OpenSearch/Endpoints/DeletePit.php b/src/OpenSearch/Endpoints/DeletePit.php
index eca440196..5c629554f 100644
--- a/src/OpenSearch/Endpoints/DeletePit.php
+++ b/src/OpenSearch/Endpoints/DeletePit.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Explain.php b/src/OpenSearch/Endpoints/Explain.php
index 9241ef835..a19f18ce4 100644
--- a/src/OpenSearch/Endpoints/Explain.php
+++ b/src/OpenSearch/Endpoints/Explain.php
@@ -76,7 +76,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/FieldCaps.php b/src/OpenSearch/Endpoints/FieldCaps.php
index d6f22027a..92d830ee0 100644
--- a/src/OpenSearch/Endpoints/FieldCaps.php
+++ b/src/OpenSearch/Endpoints/FieldCaps.php
@@ -60,7 +60,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/Create.php b/src/OpenSearch/Endpoints/FlowFramework/Create.php
index 60fbac848..f4f037ea4 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/Create.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/Create.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/Delete.php b/src/OpenSearch/Endpoints/FlowFramework/Delete.php
index c1a75384e..4dd4d0c3e 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/Delete.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/Delete.php
@@ -53,7 +53,7 @@ public function getMethod(): string
 
     public function setWorkflowId($workflow_id): static
     {
-        if (isset($workflow_id) !== true) {
+        if (is_null($workflow_id)) {
             return $this;
         }
         $this->workflow_id = $workflow_id;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/Deprovision.php b/src/OpenSearch/Endpoints/FlowFramework/Deprovision.php
index c9ef2db18..f8acb704e 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/Deprovision.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/Deprovision.php
@@ -53,7 +53,7 @@ public function getMethod(): string
 
     public function setWorkflowId($workflow_id): static
     {
-        if (isset($workflow_id) !== true) {
+        if (is_null($workflow_id)) {
             return $this;
         }
         $this->workflow_id = $workflow_id;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/Get.php b/src/OpenSearch/Endpoints/FlowFramework/Get.php
index 09226a2fa..96d43622e 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/Get.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/Get.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setWorkflowId($workflow_id): static
     {
-        if (isset($workflow_id) !== true) {
+        if (is_null($workflow_id)) {
             return $this;
         }
         $this->workflow_id = $workflow_id;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/GetStatus.php b/src/OpenSearch/Endpoints/FlowFramework/GetStatus.php
index 9576306f7..6d17ab7d0 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/GetStatus.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/GetStatus.php
@@ -53,7 +53,7 @@ public function getMethod(): string
 
     public function setWorkflowId($workflow_id): static
     {
-        if (isset($workflow_id) !== true) {
+        if (is_null($workflow_id)) {
             return $this;
         }
         $this->workflow_id = $workflow_id;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/Provision.php b/src/OpenSearch/Endpoints/FlowFramework/Provision.php
index 9ee121c8f..27c851386 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/Provision.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/Provision.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -62,7 +62,7 @@ public function setBody($body): static
 
     public function setWorkflowId($workflow_id): static
     {
-        if (isset($workflow_id) !== true) {
+        if (is_null($workflow_id)) {
             return $this;
         }
         $this->workflow_id = $workflow_id;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/Search.php b/src/OpenSearch/Endpoints/FlowFramework/Search.php
index 353287d89..b4f6b998c 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/Search.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/Search.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/SearchState.php b/src/OpenSearch/Endpoints/FlowFramework/SearchState.php
index d1ee9c7e3..e6d0b813d 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/SearchState.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/SearchState.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/FlowFramework/Update.php b/src/OpenSearch/Endpoints/FlowFramework/Update.php
index 73fa0e123..16233f8bf 100644
--- a/src/OpenSearch/Endpoints/FlowFramework/Update.php
+++ b/src/OpenSearch/Endpoints/FlowFramework/Update.php
@@ -57,7 +57,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -67,7 +67,7 @@ public function setBody($body): static
 
     public function setWorkflowId($workflow_id): static
     {
-        if (isset($workflow_id) !== true) {
+        if (is_null($workflow_id)) {
             return $this;
         }
         $this->workflow_id = $workflow_id;
diff --git a/src/OpenSearch/Endpoints/Index.php b/src/OpenSearch/Endpoints/Index.php
index 48ad123c7..fd2d9cf40 100644
--- a/src/OpenSearch/Endpoints/Index.php
+++ b/src/OpenSearch/Endpoints/Index.php
@@ -73,7 +73,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Indices/AddBlock.php b/src/OpenSearch/Endpoints/Indices/AddBlock.php
index 867c07886..e797fd353 100644
--- a/src/OpenSearch/Endpoints/Indices/AddBlock.php
+++ b/src/OpenSearch/Endpoints/Indices/AddBlock.php
@@ -65,7 +65,7 @@ public function getMethod(): string
 
     public function setBlock($block): static
     {
-        if (isset($block) !== true) {
+        if (is_null($block)) {
             return $this;
         }
         $this->block = $block;
diff --git a/src/OpenSearch/Endpoints/Indices/Analyze.php b/src/OpenSearch/Endpoints/Indices/Analyze.php
index 63f6612a4..1325039c6 100644
--- a/src/OpenSearch/Endpoints/Indices/Analyze.php
+++ b/src/OpenSearch/Endpoints/Indices/Analyze.php
@@ -56,7 +56,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Indices/CloneIndices.php b/src/OpenSearch/Endpoints/Indices/CloneIndices.php
index dd92e5344..8717637f9 100644
--- a/src/OpenSearch/Endpoints/Indices/CloneIndices.php
+++ b/src/OpenSearch/Endpoints/Indices/CloneIndices.php
@@ -65,7 +65,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -75,7 +75,7 @@ public function setBody($body): static
 
     public function setTarget($target): static
     {
-        if (isset($target) !== true) {
+        if (is_null($target)) {
             return $this;
         }
         $this->target = $target;
diff --git a/src/OpenSearch/Endpoints/Indices/Create.php b/src/OpenSearch/Endpoints/Indices/Create.php
index e0336b805..3bcdafd53 100644
--- a/src/OpenSearch/Endpoints/Indices/Create.php
+++ b/src/OpenSearch/Endpoints/Indices/Create.php
@@ -60,7 +60,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Indices/CreateDataStream.php b/src/OpenSearch/Endpoints/Indices/CreateDataStream.php
index 97a98880a..3440922ce 100644
--- a/src/OpenSearch/Endpoints/Indices/CreateDataStream.php
+++ b/src/OpenSearch/Endpoints/Indices/CreateDataStream.php
@@ -58,7 +58,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -68,7 +68,7 @@ public function setBody($body): static
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/DeleteIndexTemplate.php b/src/OpenSearch/Endpoints/Indices/DeleteIndexTemplate.php
index a4013a1e1..7f3c0ccc8 100644
--- a/src/OpenSearch/Endpoints/Indices/DeleteIndexTemplate.php
+++ b/src/OpenSearch/Endpoints/Indices/DeleteIndexTemplate.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/DeleteTemplate.php b/src/OpenSearch/Endpoints/Indices/DeleteTemplate.php
index f1137aa0a..9f322665b 100644
--- a/src/OpenSearch/Endpoints/Indices/DeleteTemplate.php
+++ b/src/OpenSearch/Endpoints/Indices/DeleteTemplate.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/ExistsIndexTemplate.php b/src/OpenSearch/Endpoints/Indices/ExistsIndexTemplate.php
index e2a57d272..43b26f255 100644
--- a/src/OpenSearch/Endpoints/Indices/ExistsIndexTemplate.php
+++ b/src/OpenSearch/Endpoints/Indices/ExistsIndexTemplate.php
@@ -62,7 +62,7 @@ public function getMethod(): string
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/PutAlias.php b/src/OpenSearch/Endpoints/Indices/PutAlias.php
index eeb8bd5c7..c50586f3e 100644
--- a/src/OpenSearch/Endpoints/Indices/PutAlias.php
+++ b/src/OpenSearch/Endpoints/Indices/PutAlias.php
@@ -67,7 +67,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -77,7 +77,7 @@ public function setBody($body): static
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/PutIndexTemplate.php b/src/OpenSearch/Endpoints/Indices/PutIndexTemplate.php
index f263c7f7f..ed18f13a2 100644
--- a/src/OpenSearch/Endpoints/Indices/PutIndexTemplate.php
+++ b/src/OpenSearch/Endpoints/Indices/PutIndexTemplate.php
@@ -62,7 +62,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -72,7 +72,7 @@ public function setBody($body): static
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/PutMapping.php b/src/OpenSearch/Endpoints/Indices/PutMapping.php
index b3f636260..0a107bdeb 100644
--- a/src/OpenSearch/Endpoints/Indices/PutMapping.php
+++ b/src/OpenSearch/Endpoints/Indices/PutMapping.php
@@ -63,7 +63,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Indices/PutSettings.php b/src/OpenSearch/Endpoints/Indices/PutSettings.php
index 0f66696c0..c927c63fe 100644
--- a/src/OpenSearch/Endpoints/Indices/PutSettings.php
+++ b/src/OpenSearch/Endpoints/Indices/PutSettings.php
@@ -63,7 +63,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Indices/PutTemplate.php b/src/OpenSearch/Endpoints/Indices/PutTemplate.php
index 666d67b38..e3253583f 100644
--- a/src/OpenSearch/Endpoints/Indices/PutTemplate.php
+++ b/src/OpenSearch/Endpoints/Indices/PutTemplate.php
@@ -62,7 +62,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -72,7 +72,7 @@ public function setBody($body): static
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/Rollover.php b/src/OpenSearch/Endpoints/Indices/Rollover.php
index 18c1519b6..cb23f4fa2 100644
--- a/src/OpenSearch/Endpoints/Indices/Rollover.php
+++ b/src/OpenSearch/Endpoints/Indices/Rollover.php
@@ -70,7 +70,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -80,7 +80,7 @@ public function setBody($body): static
 
     public function setAlias($alias): static
     {
-        if (isset($alias) !== true) {
+        if (is_null($alias)) {
             return $this;
         }
         $this->alias = $alias;
@@ -90,7 +90,7 @@ public function setAlias($alias): static
 
     public function setNewIndex($new_index): static
     {
-        if (isset($new_index) !== true) {
+        if (is_null($new_index)) {
             return $this;
         }
         $this->new_index = $new_index;
diff --git a/src/OpenSearch/Endpoints/Indices/Shrink.php b/src/OpenSearch/Endpoints/Indices/Shrink.php
index c271712bf..f1607bb6d 100644
--- a/src/OpenSearch/Endpoints/Indices/Shrink.php
+++ b/src/OpenSearch/Endpoints/Indices/Shrink.php
@@ -66,7 +66,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -76,7 +76,7 @@ public function setBody($body): static
 
     public function setTarget($target): static
     {
-        if (isset($target) !== true) {
+        if (is_null($target)) {
             return $this;
         }
         $this->target = $target;
diff --git a/src/OpenSearch/Endpoints/Indices/SimulateIndexTemplate.php b/src/OpenSearch/Endpoints/Indices/SimulateIndexTemplate.php
index fcbff55a9..1b5a7af76 100644
--- a/src/OpenSearch/Endpoints/Indices/SimulateIndexTemplate.php
+++ b/src/OpenSearch/Endpoints/Indices/SimulateIndexTemplate.php
@@ -60,7 +60,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -70,7 +70,7 @@ public function setBody($body): static
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/SimulateTemplate.php b/src/OpenSearch/Endpoints/Indices/SimulateTemplate.php
index 16ec3a9da..578e388fa 100644
--- a/src/OpenSearch/Endpoints/Indices/SimulateTemplate.php
+++ b/src/OpenSearch/Endpoints/Indices/SimulateTemplate.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -71,7 +71,7 @@ public function setBody($body): static
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Indices/Split.php b/src/OpenSearch/Endpoints/Indices/Split.php
index 3fff81d37..366a68071 100644
--- a/src/OpenSearch/Endpoints/Indices/Split.php
+++ b/src/OpenSearch/Endpoints/Indices/Split.php
@@ -66,7 +66,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -76,7 +76,7 @@ public function setBody($body): static
 
     public function setTarget($target): static
     {
-        if (isset($target) !== true) {
+        if (is_null($target)) {
             return $this;
         }
         $this->target = $target;
diff --git a/src/OpenSearch/Endpoints/Indices/UpdateAliases.php b/src/OpenSearch/Endpoints/Indices/UpdateAliases.php
index d7dcbb9f8..dc20cc23b 100644
--- a/src/OpenSearch/Endpoints/Indices/UpdateAliases.php
+++ b/src/OpenSearch/Endpoints/Indices/UpdateAliases.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Indices/Upgrade.php b/src/OpenSearch/Endpoints/Indices/Upgrade.php
index 239c1e4bf..3d6ae2898 100644
--- a/src/OpenSearch/Endpoints/Indices/Upgrade.php
+++ b/src/OpenSearch/Endpoints/Indices/Upgrade.php
@@ -57,14 +57,4 @@ public function getMethod(): string
     {
         return 'POST';
     }
-
-    public function setBody($body): static
-    {
-        if (isset($body) !== true) {
-            return $this;
-        }
-        $this->body = $body;
-
-        return $this;
-    }
 }
diff --git a/src/OpenSearch/Endpoints/Indices/ValidateQuery.php b/src/OpenSearch/Endpoints/Indices/ValidateQuery.php
index 008bebfe5..ad3e643fb 100644
--- a/src/OpenSearch/Endpoints/Indices/ValidateQuery.php
+++ b/src/OpenSearch/Endpoints/Indices/ValidateQuery.php
@@ -67,7 +67,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ingest/PutPipeline.php b/src/OpenSearch/Endpoints/Ingest/PutPipeline.php
index 1a4cef432..f3fa18adb 100644
--- a/src/OpenSearch/Endpoints/Ingest/PutPipeline.php
+++ b/src/OpenSearch/Endpoints/Ingest/PutPipeline.php
@@ -59,7 +59,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ingest/Simulate.php b/src/OpenSearch/Endpoints/Ingest/Simulate.php
index 44e3ba9d2..9a774025a 100644
--- a/src/OpenSearch/Endpoints/Ingest/Simulate.php
+++ b/src/OpenSearch/Endpoints/Ingest/Simulate.php
@@ -56,7 +56,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ism/AddPolicy.php b/src/OpenSearch/Endpoints/Ism/AddPolicy.php
index 045768abe..b31e06b6a 100644
--- a/src/OpenSearch/Endpoints/Ism/AddPolicy.php
+++ b/src/OpenSearch/Endpoints/Ism/AddPolicy.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ism/ChangePolicy.php b/src/OpenSearch/Endpoints/Ism/ChangePolicy.php
index 49dbb9d23..5424573bc 100644
--- a/src/OpenSearch/Endpoints/Ism/ChangePolicy.php
+++ b/src/OpenSearch/Endpoints/Ism/ChangePolicy.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ism/DeletePolicy.php b/src/OpenSearch/Endpoints/Ism/DeletePolicy.php
index a30b2a258..a12e44a35 100644
--- a/src/OpenSearch/Endpoints/Ism/DeletePolicy.php
+++ b/src/OpenSearch/Endpoints/Ism/DeletePolicy.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setPolicyId($policy_id): static
     {
-        if (isset($policy_id) !== true) {
+        if (is_null($policy_id)) {
             return $this;
         }
         $this->policy_id = $policy_id;
diff --git a/src/OpenSearch/Endpoints/Ism/ExistsPolicy.php b/src/OpenSearch/Endpoints/Ism/ExistsPolicy.php
index 55ea59b58..1f56fea13 100644
--- a/src/OpenSearch/Endpoints/Ism/ExistsPolicy.php
+++ b/src/OpenSearch/Endpoints/Ism/ExistsPolicy.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setPolicyId($policy_id): static
     {
-        if (isset($policy_id) !== true) {
+        if (is_null($policy_id)) {
             return $this;
         }
         $this->policy_id = $policy_id;
diff --git a/src/OpenSearch/Endpoints/Ism/ExplainPolicy.php b/src/OpenSearch/Endpoints/Ism/ExplainPolicy.php
index 35236df6b..bc9680773 100644
--- a/src/OpenSearch/Endpoints/Ism/ExplainPolicy.php
+++ b/src/OpenSearch/Endpoints/Ism/ExplainPolicy.php
@@ -49,7 +49,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ism/GetPolicy.php b/src/OpenSearch/Endpoints/Ism/GetPolicy.php
index 469dc7758..06e3066c4 100644
--- a/src/OpenSearch/Endpoints/Ism/GetPolicy.php
+++ b/src/OpenSearch/Endpoints/Ism/GetPolicy.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setPolicyId($policy_id): static
     {
-        if (isset($policy_id) !== true) {
+        if (is_null($policy_id)) {
             return $this;
         }
         $this->policy_id = $policy_id;
diff --git a/src/OpenSearch/Endpoints/Ism/PutPolicies.php b/src/OpenSearch/Endpoints/Ism/PutPolicies.php
index 5148d8811..09ec3cd92 100644
--- a/src/OpenSearch/Endpoints/Ism/PutPolicies.php
+++ b/src/OpenSearch/Endpoints/Ism/PutPolicies.php
@@ -48,7 +48,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ism/PutPolicy.php b/src/OpenSearch/Endpoints/Ism/PutPolicy.php
index e93b289b3..39c81b32e 100644
--- a/src/OpenSearch/Endpoints/Ism/PutPolicy.php
+++ b/src/OpenSearch/Endpoints/Ism/PutPolicy.php
@@ -56,7 +56,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -66,7 +66,7 @@ public function setBody($body): static
 
     public function setPolicyId($policy_id): static
     {
-        if (isset($policy_id) !== true) {
+        if (is_null($policy_id)) {
             return $this;
         }
         $this->policy_id = $policy_id;
diff --git a/src/OpenSearch/Endpoints/Ism/RetryIndex.php b/src/OpenSearch/Endpoints/Ism/RetryIndex.php
index 1056aab5e..8744420a4 100644
--- a/src/OpenSearch/Endpoints/Ism/RetryIndex.php
+++ b/src/OpenSearch/Endpoints/Ism/RetryIndex.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Knn/DeleteModel.php b/src/OpenSearch/Endpoints/Knn/DeleteModel.php
index f650a5751..81069be46 100644
--- a/src/OpenSearch/Endpoints/Knn/DeleteModel.php
+++ b/src/OpenSearch/Endpoints/Knn/DeleteModel.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setModelId($model_id): static
     {
-        if (isset($model_id) !== true) {
+        if (is_null($model_id)) {
             return $this;
         }
         $this->model_id = $model_id;
diff --git a/src/OpenSearch/Endpoints/Knn/GetModel.php b/src/OpenSearch/Endpoints/Knn/GetModel.php
index 410d884b1..1ea80d2d8 100644
--- a/src/OpenSearch/Endpoints/Knn/GetModel.php
+++ b/src/OpenSearch/Endpoints/Knn/GetModel.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setModelId($model_id): static
     {
-        if (isset($model_id) !== true) {
+        if (is_null($model_id)) {
             return $this;
         }
         $this->model_id = $model_id;
diff --git a/src/OpenSearch/Endpoints/Knn/SearchModels.php b/src/OpenSearch/Endpoints/Knn/SearchModels.php
index cd25afc58..a190a8294 100644
--- a/src/OpenSearch/Endpoints/Knn/SearchModels.php
+++ b/src/OpenSearch/Endpoints/Knn/SearchModels.php
@@ -87,7 +87,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Knn/TrainModel.php b/src/OpenSearch/Endpoints/Knn/TrainModel.php
index cf4cbc3b1..95908b1de 100644
--- a/src/OpenSearch/Endpoints/Knn/TrainModel.php
+++ b/src/OpenSearch/Endpoints/Knn/TrainModel.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -62,7 +62,7 @@ public function setBody($body): static
 
     public function setModelId($model_id): static
     {
-        if (isset($model_id) !== true) {
+        if (is_null($model_id)) {
             return $this;
         }
         $this->model_id = $model_id;
diff --git a/src/OpenSearch/Endpoints/MTermVectors.php b/src/OpenSearch/Endpoints/MTermVectors.php
index f76e08807..79190b17a 100644
--- a/src/OpenSearch/Endpoints/MTermVectors.php
+++ b/src/OpenSearch/Endpoints/MTermVectors.php
@@ -67,7 +67,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Mget.php b/src/OpenSearch/Endpoints/Mget.php
index edd7682f9..652bba7cc 100644
--- a/src/OpenSearch/Endpoints/Mget.php
+++ b/src/OpenSearch/Endpoints/Mget.php
@@ -63,7 +63,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ml/CreateConnector.php b/src/OpenSearch/Endpoints/Ml/CreateConnector.php
index 887bf9872..b7b8a46f2 100644
--- a/src/OpenSearch/Endpoints/Ml/CreateConnector.php
+++ b/src/OpenSearch/Endpoints/Ml/CreateConnector.php
@@ -43,7 +43,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ml/CreateMemory.php b/src/OpenSearch/Endpoints/Ml/CreateMemory.php
new file mode 100644
index 000000000..8f1086662
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/CreateMemory.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class CreateMemory extends AbstractEndpoint
+{
+    public function getURI(): string
+    {
+        return "/_plugins/_ml/memory";
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'POST';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/CreateMessage.php b/src/OpenSearch/Endpoints/Ml/CreateMessage.php
new file mode 100644
index 000000000..11d9dd6fc
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/CreateMessage.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class CreateMessage extends AbstractEndpoint
+{
+    protected $memory_id;
+
+    public function getURI(): string
+    {
+        $memory_id = $this->memory_id ?? null;
+        if (isset($memory_id)) {
+            return "/_plugins/_ml/memory/$memory_id/messages";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.create_message');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'POST';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setMemoryId($memory_id): static
+    {
+        if (is_null($memory_id)) {
+            return $this;
+        }
+        $this->memory_id = $memory_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/DeleteAgent.php b/src/OpenSearch/Endpoints/Ml/DeleteAgent.php
index fb8c46560..12a832141 100644
--- a/src/OpenSearch/Endpoints/Ml/DeleteAgent.php
+++ b/src/OpenSearch/Endpoints/Ml/DeleteAgent.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setAgentId($agent_id): static
     {
-        if (isset($agent_id) !== true) {
+        if (is_null($agent_id)) {
             return $this;
         }
         $this->agent_id = $agent_id;
diff --git a/src/OpenSearch/Endpoints/Ml/DeleteConnector.php b/src/OpenSearch/Endpoints/Ml/DeleteConnector.php
index 6c28dd276..500060937 100644
--- a/src/OpenSearch/Endpoints/Ml/DeleteConnector.php
+++ b/src/OpenSearch/Endpoints/Ml/DeleteConnector.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setConnectorId($connector_id): static
     {
-        if (isset($connector_id) !== true) {
+        if (is_null($connector_id)) {
             return $this;
         }
         $this->connector_id = $connector_id;
diff --git a/src/OpenSearch/Endpoints/Ml/DeleteMemory.php b/src/OpenSearch/Endpoints/Ml/DeleteMemory.php
new file mode 100644
index 000000000..5ff1ff133
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/DeleteMemory.php
@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class DeleteMemory extends AbstractEndpoint
+{
+    protected $memory_id;
+
+    public function getURI(): string
+    {
+        $memory_id = $this->memory_id ?? null;
+        if (isset($memory_id)) {
+            return "/_plugins/_ml/memory/$memory_id";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.delete_memory');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'DELETE';
+    }
+
+    public function setMemoryId($memory_id): static
+    {
+        if (is_null($memory_id)) {
+            return $this;
+        }
+        $this->memory_id = $memory_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/DeleteTask.php b/src/OpenSearch/Endpoints/Ml/DeleteTask.php
index cbff3d87a..3d71256cf 100644
--- a/src/OpenSearch/Endpoints/Ml/DeleteTask.php
+++ b/src/OpenSearch/Endpoints/Ml/DeleteTask.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setTaskId($task_id): static
     {
-        if (isset($task_id) !== true) {
+        if (is_null($task_id)) {
             return $this;
         }
         $this->task_id = $task_id;
diff --git a/src/OpenSearch/Endpoints/Ml/DeployModel.php b/src/OpenSearch/Endpoints/Ml/DeployModel.php
index e69da6946..51fc67acd 100644
--- a/src/OpenSearch/Endpoints/Ml/DeployModel.php
+++ b/src/OpenSearch/Endpoints/Ml/DeployModel.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setModelId($model_id): static
     {
-        if (isset($model_id) !== true) {
+        if (is_null($model_id)) {
             return $this;
         }
         $this->model_id = $model_id;
diff --git a/src/OpenSearch/Endpoints/Ml/GetConnector.php b/src/OpenSearch/Endpoints/Ml/GetConnector.php
index 9a612a639..ac9d1aba0 100644
--- a/src/OpenSearch/Endpoints/Ml/GetConnector.php
+++ b/src/OpenSearch/Endpoints/Ml/GetConnector.php
@@ -16,36 +16,45 @@
 use OpenSearch\Common\Exceptions\RuntimeException;
 use OpenSearch\Endpoints\AbstractEndpoint;
 
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
 class GetConnector extends AbstractEndpoint
 {
-    /**
-     * @return string[]
-     */
-    public function getParamWhitelist(): array
-    {
-        return [];
-    }
+    protected $connector_id;
 
-    /**
-     * @return string
-     */
     public function getURI(): string
     {
-        if ($this->id) {
-            return "/_plugins/_ml/connectors/$this->id";
+        $connector_id = $this->connector_id ?? null;
+        if (isset($connector_id)) {
+            return "/_plugins/_ml/connectors/$connector_id";
         }
+        throw new RuntimeException('Missing parameter for the endpoint ml.get_connector');
+    }
 
-        throw new RuntimeException(
-            'id is required for get'
-        );
-
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
     }
 
-    /**
-     * @return string
-     */
     public function getMethod(): string
     {
         return 'GET';
     }
+
+    public function setConnectorId($connector_id): static
+    {
+        if (is_null($connector_id)) {
+            return $this;
+        }
+        $this->connector_id = $connector_id;
+
+        return $this;
+    }
 }
diff --git a/src/OpenSearch/Endpoints/Ml/GetMemory.php b/src/OpenSearch/Endpoints/Ml/GetMemory.php
new file mode 100644
index 000000000..7fe40ef8a
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/GetMemory.php
@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class GetMemory extends AbstractEndpoint
+{
+    protected $memory_id;
+
+    public function getURI(): string
+    {
+        $memory_id = $this->memory_id ?? null;
+        if (isset($memory_id)) {
+            return "/_plugins/_ml/memory/$memory_id";
+        }
+        return "/_plugins/_ml/memory";
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'GET';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setMemoryId($memory_id): static
+    {
+        if (is_null($memory_id)) {
+            return $this;
+        }
+        $this->memory_id = $memory_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/GetMessage.php b/src/OpenSearch/Endpoints/Ml/GetMessage.php
new file mode 100644
index 000000000..d3b2a4ff5
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/GetMessage.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class GetMessage extends AbstractEndpoint
+{
+    protected $memory_id;
+    protected $message_id;
+
+    public function getURI(): string
+    {
+        $memory_id = $this->memory_id ?? null;
+        $message_id = $this->message_id ?? null;
+        if (isset($memory_id)) {
+            return "/_plugins/_ml/memory/$memory_id/messages";
+        }
+        if (isset($message_id)) {
+            return "/_plugins/_ml/memory/message/$message_id";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.get_message');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'GET';
+    }
+
+    public function setMemoryId($memory_id): static
+    {
+        if (is_null($memory_id)) {
+            return $this;
+        }
+        $this->memory_id = $memory_id;
+
+        return $this;
+    }
+
+    public function setMessageId($message_id): static
+    {
+        if (is_null($message_id)) {
+            return $this;
+        }
+        $this->message_id = $message_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/GetMessageTraces.php b/src/OpenSearch/Endpoints/Ml/GetMessageTraces.php
new file mode 100644
index 000000000..5698cb473
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/GetMessageTraces.php
@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class GetMessageTraces extends AbstractEndpoint
+{
+    protected $message_id;
+
+    public function getURI(): string
+    {
+        $message_id = $this->message_id ?? null;
+        if (isset($message_id)) {
+            return "/_plugins/_ml/memory/message/$message_id/traces";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.get_message_traces');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'GET';
+    }
+
+    public function setMessageId($message_id): static
+    {
+        if (is_null($message_id)) {
+            return $this;
+        }
+        $this->message_id = $message_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/GetModelGroup.php b/src/OpenSearch/Endpoints/Ml/GetModelGroup.php
index 989f9ae23..9a0ddbec2 100644
--- a/src/OpenSearch/Endpoints/Ml/GetModelGroup.php
+++ b/src/OpenSearch/Endpoints/Ml/GetModelGroup.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setModelGroupId($model_group_id): static
     {
-        if (isset($model_group_id) !== true) {
+        if (is_null($model_group_id)) {
             return $this;
         }
         $this->model_group_id = $model_group_id;
diff --git a/src/OpenSearch/Endpoints/Ml/Predict.php b/src/OpenSearch/Endpoints/Ml/Predict.php
index 034905f52..b9ce4e0b1 100644
--- a/src/OpenSearch/Endpoints/Ml/Predict.php
+++ b/src/OpenSearch/Endpoints/Ml/Predict.php
@@ -16,36 +16,67 @@
 use OpenSearch\Common\Exceptions\RuntimeException;
 use OpenSearch\Endpoints\AbstractEndpoint;
 
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
 class Predict extends AbstractEndpoint
 {
-    /**
-     * @return string[]
-     */
+    protected $algorithm_name;
+    protected $model_id;
+
+    public function getURI(): string
+    {
+        $algorithm_name = $this->algorithm_name ?? null;
+        $model_id = $this->model_id ?? null;
+        if (isset($algorithm_name) && isset($model_id)) {
+            return "/_plugins/_ml/_predict/$algorithm_name/$model_id";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.predict');
+    }
+
     public function getParamWhitelist(): array
     {
-        return [];
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
     }
 
-    /**
-     * @return string
-     */
-    public function getURI(): string
+    public function getMethod(): string
+    {
+        return 'POST';
+    }
+
+    public function setBody($body): static
     {
-        if ($this->id) {
-            return "/_plugins/_ml/models/$this->id/_predict";
+        if (is_null($body)) {
+            return $this;
         }
+        $this->body = $body;
 
-        throw new RuntimeException(
-            'id is required for predict'
-        );
+        return $this;
+    }
 
+    public function setAlgorithmName($algorithm_name): static
+    {
+        if (is_null($algorithm_name)) {
+            return $this;
+        }
+        $this->algorithm_name = $algorithm_name;
+
+        return $this;
     }
 
-    /**
-     * @return string
-     */
-    public function getMethod(): string
+    public function setModelId($model_id): static
     {
-        return 'POST';
+        if (is_null($model_id)) {
+            return $this;
+        }
+        $this->model_id = $model_id;
+
+        return $this;
     }
 }
diff --git a/src/OpenSearch/Endpoints/Ml/RegisterAgents.php b/src/OpenSearch/Endpoints/Ml/RegisterAgents.php
index 11051da16..cbfa9087e 100644
--- a/src/OpenSearch/Endpoints/Ml/RegisterAgents.php
+++ b/src/OpenSearch/Endpoints/Ml/RegisterAgents.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ml/RegisterModel.php b/src/OpenSearch/Endpoints/Ml/RegisterModel.php
index 49824326a..1cb23111d 100644
--- a/src/OpenSearch/Endpoints/Ml/RegisterModel.php
+++ b/src/OpenSearch/Endpoints/Ml/RegisterModel.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ml/RegisterModelGroup.php b/src/OpenSearch/Endpoints/Ml/RegisterModelGroup.php
index ff4943eca..6058edecf 100644
--- a/src/OpenSearch/Endpoints/Ml/RegisterModelGroup.php
+++ b/src/OpenSearch/Endpoints/Ml/RegisterModelGroup.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ml/SearchConnectors.php b/src/OpenSearch/Endpoints/Ml/SearchConnectors.php
new file mode 100644
index 000000000..b03ccf7c3
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/SearchConnectors.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class SearchConnectors extends AbstractEndpoint
+{
+    public function getURI(): string
+    {
+        return "/_plugins/_ml/connectors/_search";
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return isset($this->body) ? 'POST' : 'GET';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/SearchMemory.php b/src/OpenSearch/Endpoints/Ml/SearchMemory.php
new file mode 100644
index 000000000..938b7ed4b
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/SearchMemory.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class SearchMemory extends AbstractEndpoint
+{
+    public function getURI(): string
+    {
+        return "/_plugins/_ml/memory/_search";
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return isset($this->body) ? 'POST' : 'GET';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/SearchMessage.php b/src/OpenSearch/Endpoints/Ml/SearchMessage.php
new file mode 100644
index 000000000..101cf4862
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/SearchMessage.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class SearchMessage extends AbstractEndpoint
+{
+    protected $memory_id;
+
+    public function getURI(): string
+    {
+        $memory_id = $this->memory_id ?? null;
+        if (isset($memory_id)) {
+            return "/_plugins/_ml/memory/$memory_id/_search";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.search_message');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return isset($this->body) ? 'POST' : 'GET';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setMemoryId($memory_id): static
+    {
+        if (is_null($memory_id)) {
+            return $this;
+        }
+        $this->memory_id = $memory_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/SearchModelGroup.php b/src/OpenSearch/Endpoints/Ml/SearchModelGroup.php
new file mode 100644
index 000000000..68d8feca2
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/SearchModelGroup.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class SearchModelGroup extends AbstractEndpoint
+{
+    public function getURI(): string
+    {
+        return "/_plugins/_ml/model_groups/_search";
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return isset($this->body) ? 'POST' : 'GET';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/SearchModels.php b/src/OpenSearch/Endpoints/Ml/SearchModels.php
index 84512e7c5..25d7e06b4 100644
--- a/src/OpenSearch/Endpoints/Ml/SearchModels.php
+++ b/src/OpenSearch/Endpoints/Ml/SearchModels.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ml/Train.php b/src/OpenSearch/Endpoints/Ml/Train.php
new file mode 100644
index 000000000..6273ac4df
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/Train.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class Train extends AbstractEndpoint
+{
+    protected $algorithm_name;
+
+    public function getURI(): string
+    {
+        $algorithm_name = $this->algorithm_name ?? null;
+        if (isset($algorithm_name)) {
+            return "/_plugins/_ml/_train/$algorithm_name";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.train');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'POST';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setAlgorithmName($algorithm_name): static
+    {
+        if (is_null($algorithm_name)) {
+            return $this;
+        }
+        $this->algorithm_name = $algorithm_name;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/TrainPredict.php b/src/OpenSearch/Endpoints/Ml/TrainPredict.php
new file mode 100644
index 000000000..6c289bd28
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/TrainPredict.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class TrainPredict extends AbstractEndpoint
+{
+    protected $algorithm_name;
+
+    public function getURI(): string
+    {
+        $algorithm_name = $this->algorithm_name ?? null;
+        if (isset($algorithm_name)) {
+            return "/_plugins/_ml/_train_predict/$algorithm_name";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.train_predict');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'POST';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setAlgorithmName($algorithm_name): static
+    {
+        if (is_null($algorithm_name)) {
+            return $this;
+        }
+        $this->algorithm_name = $algorithm_name;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/UndeployModel.php b/src/OpenSearch/Endpoints/Ml/UndeployModel.php
index 3aff2bad8..313dba614 100644
--- a/src/OpenSearch/Endpoints/Ml/UndeployModel.php
+++ b/src/OpenSearch/Endpoints/Ml/UndeployModel.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setModelId($model_id): static
     {
-        if (isset($model_id) !== true) {
+        if (is_null($model_id)) {
             return $this;
         }
         $this->model_id = $model_id;
diff --git a/src/OpenSearch/Endpoints/Ml/UpdateConnector.php b/src/OpenSearch/Endpoints/Ml/UpdateConnector.php
new file mode 100644
index 000000000..ee530b8b7
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/UpdateConnector.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class UpdateConnector extends AbstractEndpoint
+{
+    protected $connector_id;
+
+    public function getURI(): string
+    {
+        $connector_id = $this->connector_id ?? null;
+        if (isset($connector_id)) {
+            return "/_plugins/_ml/connectors/$connector_id";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.update_connector');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'PUT';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setConnectorId($connector_id): static
+    {
+        if (is_null($connector_id)) {
+            return $this;
+        }
+        $this->connector_id = $connector_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/UpdateMemory.php b/src/OpenSearch/Endpoints/Ml/UpdateMemory.php
new file mode 100644
index 000000000..a87d0f36f
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/UpdateMemory.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class UpdateMemory extends AbstractEndpoint
+{
+    protected $memory_id;
+
+    public function getURI(): string
+    {
+        $memory_id = $this->memory_id ?? null;
+        if (isset($memory_id)) {
+            return "/_plugins/_ml/memory/$memory_id";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.update_memory');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'PUT';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setMemoryId($memory_id): static
+    {
+        if (is_null($memory_id)) {
+            return $this;
+        }
+        $this->memory_id = $memory_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/UpdateMessage.php b/src/OpenSearch/Endpoints/Ml/UpdateMessage.php
new file mode 100644
index 000000000..1cea2b63f
--- /dev/null
+++ b/src/OpenSearch/Endpoints/Ml/UpdateMessage.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+namespace OpenSearch\Endpoints\Ml;
+
+use OpenSearch\Common\Exceptions\RuntimeException;
+use OpenSearch\Endpoints\AbstractEndpoint;
+
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
+class UpdateMessage extends AbstractEndpoint
+{
+    protected $message_id;
+
+    public function getURI(): string
+    {
+        $message_id = $this->message_id ?? null;
+        if (isset($message_id)) {
+            return "/_plugins/_ml/memory/message/$message_id";
+        }
+        throw new RuntimeException('Missing parameter for the endpoint ml.update_message');
+    }
+
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
+    }
+
+    public function getMethod(): string
+    {
+        return 'PUT';
+    }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setMessageId($message_id): static
+    {
+        if (is_null($message_id)) {
+            return $this;
+        }
+        $this->message_id = $message_id;
+
+        return $this;
+    }
+}
diff --git a/src/OpenSearch/Endpoints/Ml/UpdateModelGroup.php b/src/OpenSearch/Endpoints/Ml/UpdateModelGroup.php
index 48d3809c3..9eb0b7597 100644
--- a/src/OpenSearch/Endpoints/Ml/UpdateModelGroup.php
+++ b/src/OpenSearch/Endpoints/Ml/UpdateModelGroup.php
@@ -16,35 +16,55 @@
 use OpenSearch\Common\Exceptions\RuntimeException;
 use OpenSearch\Endpoints\AbstractEndpoint;
 
+/**
+ * NOTE: This file is autogenerated using util/GenerateEndpoints.php
+ */
 class UpdateModelGroup extends AbstractEndpoint
 {
-    /**
-     * @return string[]
-     */
-    public function getParamWhitelist(): array
-    {
-        return [];
-    }
+    protected $model_group_id;
 
-    /**
-     * @return string
-     */
     public function getURI(): string
     {
-        if ($this->id) {
-            return "/_plugins/_ml/model_groups/$this->id";
+        $model_group_id = $this->model_group_id ?? null;
+        if (isset($model_group_id)) {
+            return "/_plugins/_ml/model_groups/$model_group_id";
         }
+        throw new RuntimeException('Missing parameter for the endpoint ml.update_model_group');
+    }
 
-        throw new RuntimeException(
-            'id is required for update'
-        );
+    public function getParamWhitelist(): array
+    {
+        return [
+            'pretty',
+            'human',
+            'error_trace',
+            'source',
+            'filter_path'
+        ];
     }
 
-    /**
-     * @return string
-     */
     public function getMethod(): string
     {
         return 'PUT';
     }
+
+    public function setBody($body): static
+    {
+        if (is_null($body)) {
+            return $this;
+        }
+        $this->body = $body;
+
+        return $this;
+    }
+
+    public function setModelGroupId($model_group_id): static
+    {
+        if (is_null($model_group_id)) {
+            return $this;
+        }
+        $this->model_group_id = $model_group_id;
+
+        return $this;
+    }
 }
diff --git a/src/OpenSearch/Endpoints/Msearch.php b/src/OpenSearch/Endpoints/Msearch.php
index a7e392857..3994ea291 100644
--- a/src/OpenSearch/Endpoints/Msearch.php
+++ b/src/OpenSearch/Endpoints/Msearch.php
@@ -68,23 +68,25 @@ public function getMethod(): string
         return isset($this->body) ? 'POST' : 'GET';
     }
 
-    public function setBody($body): static
+    public function setBody(string|iterable|null $body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
-        if (is_array($body) === true || $body instanceof Traversable) {
-            foreach ($body as $item) {
-                $this->body .= $this->serializer->serialize($item) . "\n";
+
+        if (is_string($body)) {
+            if (!str_ends_with($body, "\n")) {
+                $body .= "\n";
             }
-        } elseif (is_string($body)) {
             $this->body = $body;
-            if (substr($body, -1) != "\n") {
-                $this->body .= "\n";
-            }
-        } else {
-            throw new InvalidArgumentException("Body must be an array, traversable object or string");
+            return $this;
         }
+
+        // Must be an iterable.
+        foreach ($body as $item) {
+            $this->body .= $this->serializer->serialize($item) . "\n";
+        }
+
         return $this;
     }
 
diff --git a/src/OpenSearch/Endpoints/MsearchTemplate.php b/src/OpenSearch/Endpoints/MsearchTemplate.php
index 247882f7f..8a730b490 100644
--- a/src/OpenSearch/Endpoints/MsearchTemplate.php
+++ b/src/OpenSearch/Endpoints/MsearchTemplate.php
@@ -66,23 +66,25 @@ public function getMethod(): string
         return isset($this->body) ? 'POST' : 'GET';
     }
 
-    public function setBody($body): static
+    public function setBody(string|iterable|null $body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
-        if (is_array($body) === true || $body instanceof Traversable) {
-            foreach ($body as $item) {
-                $this->body .= $this->serializer->serialize($item) . "\n";
+
+        if (is_string($body)) {
+            if (!str_ends_with($body, "\n")) {
+                $body .= "\n";
             }
-        } elseif (is_string($body)) {
             $this->body = $body;
-            if (substr($body, -1) != "\n") {
-                $this->body .= "\n";
-            }
-        } else {
-            throw new InvalidArgumentException("Body must be an array, traversable object or string");
+            return $this;
         }
+
+        // Must be an iterable.
+        foreach ($body as $item) {
+            $this->body .= $this->serializer->serialize($item) . "\n";
+        }
+
         return $this;
     }
 
diff --git a/src/OpenSearch/Endpoints/Nodes/Info.php b/src/OpenSearch/Endpoints/Nodes/Info.php
index da403a7c8..03208412c 100644
--- a/src/OpenSearch/Endpoints/Nodes/Info.php
+++ b/src/OpenSearch/Endpoints/Nodes/Info.php
@@ -72,7 +72,7 @@ public function getMethod(): string
 
     public function setNodeIdOrMetric($node_id_or_metric): static
     {
-        if (isset($node_id_or_metric) !== true) {
+        if (is_null($node_id_or_metric)) {
             return $this;
         }
         $this->node_id_or_metric = $node_id_or_metric;
diff --git a/src/OpenSearch/Endpoints/Nodes/ReloadSecureSettings.php b/src/OpenSearch/Endpoints/Nodes/ReloadSecureSettings.php
index 6b3a6a140..1f74c3fbe 100644
--- a/src/OpenSearch/Endpoints/Nodes/ReloadSecureSettings.php
+++ b/src/OpenSearch/Endpoints/Nodes/ReloadSecureSettings.php
@@ -58,7 +58,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Notifications/CreateConfig.php b/src/OpenSearch/Endpoints/Notifications/CreateConfig.php
index a21b3c4ce..d1a8797c7 100644
--- a/src/OpenSearch/Endpoints/Notifications/CreateConfig.php
+++ b/src/OpenSearch/Endpoints/Notifications/CreateConfig.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Notifications/DeleteConfig.php b/src/OpenSearch/Endpoints/Notifications/DeleteConfig.php
index 6bab9ea4f..d4bf129ef 100644
--- a/src/OpenSearch/Endpoints/Notifications/DeleteConfig.php
+++ b/src/OpenSearch/Endpoints/Notifications/DeleteConfig.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setConfigId($config_id): static
     {
-        if (isset($config_id) !== true) {
+        if (is_null($config_id)) {
             return $this;
         }
         $this->config_id = $config_id;
diff --git a/src/OpenSearch/Endpoints/Notifications/GetConfig.php b/src/OpenSearch/Endpoints/Notifications/GetConfig.php
index 444dfb10c..7e67117f7 100644
--- a/src/OpenSearch/Endpoints/Notifications/GetConfig.php
+++ b/src/OpenSearch/Endpoints/Notifications/GetConfig.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setConfigId($config_id): static
     {
-        if (isset($config_id) !== true) {
+        if (is_null($config_id)) {
             return $this;
         }
         $this->config_id = $config_id;
diff --git a/src/OpenSearch/Endpoints/Notifications/GetConfigs.php b/src/OpenSearch/Endpoints/Notifications/GetConfigs.php
index 22d250e16..5c02105fe 100644
--- a/src/OpenSearch/Endpoints/Notifications/GetConfigs.php
+++ b/src/OpenSearch/Endpoints/Notifications/GetConfigs.php
@@ -85,7 +85,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Notifications/SendTest.php b/src/OpenSearch/Endpoints/Notifications/SendTest.php
index 2ff691812..c9f237b1a 100644
--- a/src/OpenSearch/Endpoints/Notifications/SendTest.php
+++ b/src/OpenSearch/Endpoints/Notifications/SendTest.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setConfigId($config_id): static
     {
-        if (isset($config_id) !== true) {
+        if (is_null($config_id)) {
             return $this;
         }
         $this->config_id = $config_id;
diff --git a/src/OpenSearch/Endpoints/Notifications/UpdateConfig.php b/src/OpenSearch/Endpoints/Notifications/UpdateConfig.php
index 55fa55758..e8b551d78 100644
--- a/src/OpenSearch/Endpoints/Notifications/UpdateConfig.php
+++ b/src/OpenSearch/Endpoints/Notifications/UpdateConfig.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -62,7 +62,7 @@ public function setBody($body): static
 
     public function setConfigId($config_id): static
     {
-        if (isset($config_id) !== true) {
+        if (is_null($config_id)) {
             return $this;
         }
         $this->config_id = $config_id;
diff --git a/src/OpenSearch/Endpoints/Observability/CreateObject.php b/src/OpenSearch/Endpoints/Observability/CreateObject.php
index a88377e5c..7002addcb 100644
--- a/src/OpenSearch/Endpoints/Observability/CreateObject.php
+++ b/src/OpenSearch/Endpoints/Observability/CreateObject.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Observability/DeleteObject.php b/src/OpenSearch/Endpoints/Observability/DeleteObject.php
index 308d4da41..bbc38c27a 100644
--- a/src/OpenSearch/Endpoints/Observability/DeleteObject.php
+++ b/src/OpenSearch/Endpoints/Observability/DeleteObject.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setObjectId($object_id): static
     {
-        if (isset($object_id) !== true) {
+        if (is_null($object_id)) {
             return $this;
         }
         $this->object_id = $object_id;
diff --git a/src/OpenSearch/Endpoints/Observability/GetObject.php b/src/OpenSearch/Endpoints/Observability/GetObject.php
index ed967f9bc..94c65fd89 100644
--- a/src/OpenSearch/Endpoints/Observability/GetObject.php
+++ b/src/OpenSearch/Endpoints/Observability/GetObject.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setObjectId($object_id): static
     {
-        if (isset($object_id) !== true) {
+        if (is_null($object_id)) {
             return $this;
         }
         $this->object_id = $object_id;
diff --git a/src/OpenSearch/Endpoints/Observability/UpdateObject.php b/src/OpenSearch/Endpoints/Observability/UpdateObject.php
index 69d44e46f..a4567f213 100644
--- a/src/OpenSearch/Endpoints/Observability/UpdateObject.php
+++ b/src/OpenSearch/Endpoints/Observability/UpdateObject.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -62,7 +62,7 @@ public function setBody($body): static
 
     public function setObjectId($object_id): static
     {
-        if (isset($object_id) !== true) {
+        if (is_null($object_id)) {
             return $this;
         }
         $this->object_id = $object_id;
diff --git a/src/OpenSearch/Endpoints/Ppl/Explain.php b/src/OpenSearch/Endpoints/Ppl/Explain.php
index 4e1c04683..b49f52e1f 100644
--- a/src/OpenSearch/Endpoints/Ppl/Explain.php
+++ b/src/OpenSearch/Endpoints/Ppl/Explain.php
@@ -47,7 +47,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ppl/PostStats.php b/src/OpenSearch/Endpoints/Ppl/PostStats.php
index e7763bdce..0178628df 100644
--- a/src/OpenSearch/Endpoints/Ppl/PostStats.php
+++ b/src/OpenSearch/Endpoints/Ppl/PostStats.php
@@ -47,7 +47,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Ppl/Query.php b/src/OpenSearch/Endpoints/Ppl/Query.php
index 47c31e35e..f67cd566e 100644
--- a/src/OpenSearch/Endpoints/Ppl/Query.php
+++ b/src/OpenSearch/Endpoints/Ppl/Query.php
@@ -47,7 +47,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/PutScript.php b/src/OpenSearch/Endpoints/PutScript.php
index 43323828b..4074423fa 100644
--- a/src/OpenSearch/Endpoints/PutScript.php
+++ b/src/OpenSearch/Endpoints/PutScript.php
@@ -68,7 +68,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -78,7 +78,7 @@ public function setBody($body): static
 
     public function setContext($context): static
     {
-        if (isset($context) !== true) {
+        if (is_null($context)) {
             return $this;
         }
         $this->context = $context;
diff --git a/src/OpenSearch/Endpoints/Query/DatasourceDelete.php b/src/OpenSearch/Endpoints/Query/DatasourceDelete.php
index 717019ba4..ccb0b1560 100644
--- a/src/OpenSearch/Endpoints/Query/DatasourceDelete.php
+++ b/src/OpenSearch/Endpoints/Query/DatasourceDelete.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setDatasourceName($datasource_name): static
     {
-        if (isset($datasource_name) !== true) {
+        if (is_null($datasource_name)) {
             return $this;
         }
         $this->datasource_name = $datasource_name;
diff --git a/src/OpenSearch/Endpoints/Query/DatasourceRetrieve.php b/src/OpenSearch/Endpoints/Query/DatasourceRetrieve.php
index e04725583..f7f54fb0e 100644
--- a/src/OpenSearch/Endpoints/Query/DatasourceRetrieve.php
+++ b/src/OpenSearch/Endpoints/Query/DatasourceRetrieve.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setDatasourceName($datasource_name): static
     {
-        if (isset($datasource_name) !== true) {
+        if (is_null($datasource_name)) {
             return $this;
         }
         $this->datasource_name = $datasource_name;
diff --git a/src/OpenSearch/Endpoints/Query/DatasourcesCreate.php b/src/OpenSearch/Endpoints/Query/DatasourcesCreate.php
index 9f1c2d4e2..ba2d457aa 100644
--- a/src/OpenSearch/Endpoints/Query/DatasourcesCreate.php
+++ b/src/OpenSearch/Endpoints/Query/DatasourcesCreate.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Query/DatasourcesUpdate.php b/src/OpenSearch/Endpoints/Query/DatasourcesUpdate.php
index 6836d7261..92905dabb 100644
--- a/src/OpenSearch/Endpoints/Query/DatasourcesUpdate.php
+++ b/src/OpenSearch/Endpoints/Query/DatasourcesUpdate.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/RankEval.php b/src/OpenSearch/Endpoints/RankEval.php
index 4b1b23de1..cb794bc6e 100644
--- a/src/OpenSearch/Endpoints/RankEval.php
+++ b/src/OpenSearch/Endpoints/RankEval.php
@@ -59,7 +59,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Reindex.php b/src/OpenSearch/Endpoints/Reindex.php
index 85b19007d..c65560a65 100644
--- a/src/OpenSearch/Endpoints/Reindex.php
+++ b/src/OpenSearch/Endpoints/Reindex.php
@@ -59,7 +59,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/ReindexRethrottle.php b/src/OpenSearch/Endpoints/ReindexRethrottle.php
index fbbdb5290..1b1403d1a 100644
--- a/src/OpenSearch/Endpoints/ReindexRethrottle.php
+++ b/src/OpenSearch/Endpoints/ReindexRethrottle.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setTaskId($task_id): static
     {
-        if (isset($task_id) !== true) {
+        if (is_null($task_id)) {
             return $this;
         }
         $this->task_id = $task_id;
diff --git a/src/OpenSearch/Endpoints/RemoteStore/Restore.php b/src/OpenSearch/Endpoints/RemoteStore/Restore.php
index fb4c6c415..36c240ce2 100644
--- a/src/OpenSearch/Endpoints/RemoteStore/Restore.php
+++ b/src/OpenSearch/Endpoints/RemoteStore/Restore.php
@@ -47,7 +47,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/RenderSearchTemplate.php b/src/OpenSearch/Endpoints/RenderSearchTemplate.php
index 48e320423..8a7a83ab8 100644
--- a/src/OpenSearch/Endpoints/RenderSearchTemplate.php
+++ b/src/OpenSearch/Endpoints/RenderSearchTemplate.php
@@ -55,7 +55,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Replication/CreateReplicationRule.php b/src/OpenSearch/Endpoints/Replication/CreateReplicationRule.php
index 01c2c1002..5048dce00 100644
--- a/src/OpenSearch/Endpoints/Replication/CreateReplicationRule.php
+++ b/src/OpenSearch/Endpoints/Replication/CreateReplicationRule.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Replication/DeleteReplicationRule.php b/src/OpenSearch/Endpoints/Replication/DeleteReplicationRule.php
index 5a0715afe..29f25078f 100644
--- a/src/OpenSearch/Endpoints/Replication/DeleteReplicationRule.php
+++ b/src/OpenSearch/Endpoints/Replication/DeleteReplicationRule.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Replication/Pause.php b/src/OpenSearch/Endpoints/Replication/Pause.php
index b31b960da..eb3cc8ad7 100644
--- a/src/OpenSearch/Endpoints/Replication/Pause.php
+++ b/src/OpenSearch/Endpoints/Replication/Pause.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Replication/Resume.php b/src/OpenSearch/Endpoints/Replication/Resume.php
index b8642f56c..b3a724c3e 100644
--- a/src/OpenSearch/Endpoints/Replication/Resume.php
+++ b/src/OpenSearch/Endpoints/Replication/Resume.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Replication/Start.php b/src/OpenSearch/Endpoints/Replication/Start.php
index d82c9294d..1a08c7012 100644
--- a/src/OpenSearch/Endpoints/Replication/Start.php
+++ b/src/OpenSearch/Endpoints/Replication/Start.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Replication/Stop.php b/src/OpenSearch/Endpoints/Replication/Stop.php
index 5e61624b5..6a2790ca7 100644
--- a/src/OpenSearch/Endpoints/Replication/Stop.php
+++ b/src/OpenSearch/Endpoints/Replication/Stop.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Replication/UpdateSettings.php b/src/OpenSearch/Endpoints/Replication/UpdateSettings.php
index 202e80d65..19fea21c4 100644
--- a/src/OpenSearch/Endpoints/Replication/UpdateSettings.php
+++ b/src/OpenSearch/Endpoints/Replication/UpdateSettings.php
@@ -50,7 +50,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Rollups/Put.php b/src/OpenSearch/Endpoints/Rollups/Put.php
index dc8ec8458..27df199fa 100644
--- a/src/OpenSearch/Endpoints/Rollups/Put.php
+++ b/src/OpenSearch/Endpoints/Rollups/Put.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/ScriptsPainlessExecute.php b/src/OpenSearch/Endpoints/ScriptsPainlessExecute.php
index 1e3ecef26..d7b27ec8d 100644
--- a/src/OpenSearch/Endpoints/ScriptsPainlessExecute.php
+++ b/src/OpenSearch/Endpoints/ScriptsPainlessExecute.php
@@ -51,7 +51,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Scroll.php b/src/OpenSearch/Endpoints/Scroll.php
index f4042d833..b2c9ea7bc 100644
--- a/src/OpenSearch/Endpoints/Scroll.php
+++ b/src/OpenSearch/Endpoints/Scroll.php
@@ -64,7 +64,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -74,7 +74,7 @@ public function setBody($body): static
 
     public function setScrollId($scroll_id): static
     {
-        if (isset($scroll_id) !== true) {
+        if (is_null($scroll_id)) {
             return $this;
         }
         $this->scroll_id = $scroll_id;
diff --git a/src/OpenSearch/Endpoints/Search.php b/src/OpenSearch/Endpoints/Search.php
index 8380e3f5b..8e0e2ba1f 100644
--- a/src/OpenSearch/Endpoints/Search.php
+++ b/src/OpenSearch/Endpoints/Search.php
@@ -101,7 +101,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/SearchPipeline/Put.php b/src/OpenSearch/Endpoints/SearchPipeline/Put.php
index dc0332a52..c73b3b952 100644
--- a/src/OpenSearch/Endpoints/SearchPipeline/Put.php
+++ b/src/OpenSearch/Endpoints/SearchPipeline/Put.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/SearchShards.php b/src/OpenSearch/Endpoints/SearchShards.php
index 86fecc60f..f777c44cc 100644
--- a/src/OpenSearch/Endpoints/SearchShards.php
+++ b/src/OpenSearch/Endpoints/SearchShards.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/SearchTemplate.php b/src/OpenSearch/Endpoints/SearchTemplate.php
index e52369161..d23b0a559 100644
--- a/src/OpenSearch/Endpoints/SearchTemplate.php
+++ b/src/OpenSearch/Endpoints/SearchTemplate.php
@@ -68,7 +68,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/ChangePassword.php b/src/OpenSearch/Endpoints/Security/ChangePassword.php
index 494921f5c..562a17542 100644
--- a/src/OpenSearch/Endpoints/Security/ChangePassword.php
+++ b/src/OpenSearch/Endpoints/Security/ChangePassword.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/ConfigUpgradePerform.php b/src/OpenSearch/Endpoints/Security/ConfigUpgradePerform.php
index cc68e11fa..d7e1b53a4 100644
--- a/src/OpenSearch/Endpoints/Security/ConfigUpgradePerform.php
+++ b/src/OpenSearch/Endpoints/Security/ConfigUpgradePerform.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/CreateActionGroup.php b/src/OpenSearch/Endpoints/Security/CreateActionGroup.php
index dfb844c02..9525f3f80 100644
--- a/src/OpenSearch/Endpoints/Security/CreateActionGroup.php
+++ b/src/OpenSearch/Endpoints/Security/CreateActionGroup.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setActionGroup($action_group): static
     {
-        if (isset($action_group) !== true) {
+        if (is_null($action_group)) {
             return $this;
         }
         $this->action_group = $action_group;
diff --git a/src/OpenSearch/Endpoints/Security/CreateAllowlist.php b/src/OpenSearch/Endpoints/Security/CreateAllowlist.php
index 1cccd618d..c938f1260 100644
--- a/src/OpenSearch/Endpoints/Security/CreateAllowlist.php
+++ b/src/OpenSearch/Endpoints/Security/CreateAllowlist.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/CreateRole.php b/src/OpenSearch/Endpoints/Security/CreateRole.php
index 5bf8a7b58..8226eb657 100644
--- a/src/OpenSearch/Endpoints/Security/CreateRole.php
+++ b/src/OpenSearch/Endpoints/Security/CreateRole.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setRole($role): static
     {
-        if (isset($role) !== true) {
+        if (is_null($role)) {
             return $this;
         }
         $this->role = $role;
diff --git a/src/OpenSearch/Endpoints/Security/CreateRoleMapping.php b/src/OpenSearch/Endpoints/Security/CreateRoleMapping.php
index 7acbb7925..d271faf1a 100644
--- a/src/OpenSearch/Endpoints/Security/CreateRoleMapping.php
+++ b/src/OpenSearch/Endpoints/Security/CreateRoleMapping.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setRole($role): static
     {
-        if (isset($role) !== true) {
+        if (is_null($role)) {
             return $this;
         }
         $this->role = $role;
diff --git a/src/OpenSearch/Endpoints/Security/CreateTenant.php b/src/OpenSearch/Endpoints/Security/CreateTenant.php
index 5463d44da..0f63ffa55 100644
--- a/src/OpenSearch/Endpoints/Security/CreateTenant.php
+++ b/src/OpenSearch/Endpoints/Security/CreateTenant.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setTenant($tenant): static
     {
-        if (isset($tenant) !== true) {
+        if (is_null($tenant)) {
             return $this;
         }
         $this->tenant = $tenant;
diff --git a/src/OpenSearch/Endpoints/Security/CreateUpdateTenancyConfig.php b/src/OpenSearch/Endpoints/Security/CreateUpdateTenancyConfig.php
index 15574d10c..7989d2b0d 100644
--- a/src/OpenSearch/Endpoints/Security/CreateUpdateTenancyConfig.php
+++ b/src/OpenSearch/Endpoints/Security/CreateUpdateTenancyConfig.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/CreateUser.php b/src/OpenSearch/Endpoints/Security/CreateUser.php
index a43677385..538ea90d8 100644
--- a/src/OpenSearch/Endpoints/Security/CreateUser.php
+++ b/src/OpenSearch/Endpoints/Security/CreateUser.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/CreateUserLegacy.php b/src/OpenSearch/Endpoints/Security/CreateUserLegacy.php
index 4e2bd51fb..42f34f1c4 100644
--- a/src/OpenSearch/Endpoints/Security/CreateUserLegacy.php
+++ b/src/OpenSearch/Endpoints/Security/CreateUserLegacy.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/DeleteActionGroup.php b/src/OpenSearch/Endpoints/Security/DeleteActionGroup.php
index 9645e761d..d707e6a47 100644
--- a/src/OpenSearch/Endpoints/Security/DeleteActionGroup.php
+++ b/src/OpenSearch/Endpoints/Security/DeleteActionGroup.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setActionGroup($action_group): static
     {
-        if (isset($action_group) !== true) {
+        if (is_null($action_group)) {
             return $this;
         }
         $this->action_group = $action_group;
diff --git a/src/OpenSearch/Endpoints/Security/DeleteDistinguishedName.php b/src/OpenSearch/Endpoints/Security/DeleteDistinguishedName.php
index f80c7e9c3..98769ed35 100644
--- a/src/OpenSearch/Endpoints/Security/DeleteDistinguishedName.php
+++ b/src/OpenSearch/Endpoints/Security/DeleteDistinguishedName.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setClusterName($cluster_name): static
     {
-        if (isset($cluster_name) !== true) {
+        if (is_null($cluster_name)) {
             return $this;
         }
         $this->cluster_name = $cluster_name;
diff --git a/src/OpenSearch/Endpoints/Security/DeleteRole.php b/src/OpenSearch/Endpoints/Security/DeleteRole.php
index aa906d66f..c1f508a3a 100644
--- a/src/OpenSearch/Endpoints/Security/DeleteRole.php
+++ b/src/OpenSearch/Endpoints/Security/DeleteRole.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setRole($role): static
     {
-        if (isset($role) !== true) {
+        if (is_null($role)) {
             return $this;
         }
         $this->role = $role;
diff --git a/src/OpenSearch/Endpoints/Security/DeleteRoleMapping.php b/src/OpenSearch/Endpoints/Security/DeleteRoleMapping.php
index 67b6d54a4..cd748a24f 100644
--- a/src/OpenSearch/Endpoints/Security/DeleteRoleMapping.php
+++ b/src/OpenSearch/Endpoints/Security/DeleteRoleMapping.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setRole($role): static
     {
-        if (isset($role) !== true) {
+        if (is_null($role)) {
             return $this;
         }
         $this->role = $role;
diff --git a/src/OpenSearch/Endpoints/Security/DeleteTenant.php b/src/OpenSearch/Endpoints/Security/DeleteTenant.php
index d2e4d89e1..911a06f72 100644
--- a/src/OpenSearch/Endpoints/Security/DeleteTenant.php
+++ b/src/OpenSearch/Endpoints/Security/DeleteTenant.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setTenant($tenant): static
     {
-        if (isset($tenant) !== true) {
+        if (is_null($tenant)) {
             return $this;
         }
         $this->tenant = $tenant;
diff --git a/src/OpenSearch/Endpoints/Security/DeleteUser.php b/src/OpenSearch/Endpoints/Security/DeleteUser.php
index 10c3b5937..cfaa68df8 100644
--- a/src/OpenSearch/Endpoints/Security/DeleteUser.php
+++ b/src/OpenSearch/Endpoints/Security/DeleteUser.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/DeleteUserLegacy.php b/src/OpenSearch/Endpoints/Security/DeleteUserLegacy.php
index cdaf73156..88ec441bd 100644
--- a/src/OpenSearch/Endpoints/Security/DeleteUserLegacy.php
+++ b/src/OpenSearch/Endpoints/Security/DeleteUserLegacy.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/GenerateOboToken.php b/src/OpenSearch/Endpoints/Security/GenerateOboToken.php
index 503d30219..187ca2859 100644
--- a/src/OpenSearch/Endpoints/Security/GenerateOboToken.php
+++ b/src/OpenSearch/Endpoints/Security/GenerateOboToken.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/GenerateUserToken.php b/src/OpenSearch/Endpoints/Security/GenerateUserToken.php
index 16d214569..3b5ceec30 100644
--- a/src/OpenSearch/Endpoints/Security/GenerateUserToken.php
+++ b/src/OpenSearch/Endpoints/Security/GenerateUserToken.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/GenerateUserTokenLegacy.php b/src/OpenSearch/Endpoints/Security/GenerateUserTokenLegacy.php
index 4ebdfecdf..ccb2c65e7 100644
--- a/src/OpenSearch/Endpoints/Security/GenerateUserTokenLegacy.php
+++ b/src/OpenSearch/Endpoints/Security/GenerateUserTokenLegacy.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/GetActionGroup.php b/src/OpenSearch/Endpoints/Security/GetActionGroup.php
index c0c51c547..9c874e49f 100644
--- a/src/OpenSearch/Endpoints/Security/GetActionGroup.php
+++ b/src/OpenSearch/Endpoints/Security/GetActionGroup.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setActionGroup($action_group): static
     {
-        if (isset($action_group) !== true) {
+        if (is_null($action_group)) {
             return $this;
         }
         $this->action_group = $action_group;
diff --git a/src/OpenSearch/Endpoints/Security/GetDistinguishedName.php b/src/OpenSearch/Endpoints/Security/GetDistinguishedName.php
index e7dd3ee05..8bf1266d2 100644
--- a/src/OpenSearch/Endpoints/Security/GetDistinguishedName.php
+++ b/src/OpenSearch/Endpoints/Security/GetDistinguishedName.php
@@ -55,7 +55,7 @@ public function getMethod(): string
 
     public function setClusterName($cluster_name): static
     {
-        if (isset($cluster_name) !== true) {
+        if (is_null($cluster_name)) {
             return $this;
         }
         $this->cluster_name = $cluster_name;
diff --git a/src/OpenSearch/Endpoints/Security/GetNodeCertificates.php b/src/OpenSearch/Endpoints/Security/GetNodeCertificates.php
index a0013349f..2a22e2f83 100644
--- a/src/OpenSearch/Endpoints/Security/GetNodeCertificates.php
+++ b/src/OpenSearch/Endpoints/Security/GetNodeCertificates.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setNodeId($node_id): static
     {
-        if (isset($node_id) !== true) {
+        if (is_null($node_id)) {
             return $this;
         }
         $this->node_id = $node_id;
diff --git a/src/OpenSearch/Endpoints/Security/GetRole.php b/src/OpenSearch/Endpoints/Security/GetRole.php
index de9dfc71c..c38ee5025 100644
--- a/src/OpenSearch/Endpoints/Security/GetRole.php
+++ b/src/OpenSearch/Endpoints/Security/GetRole.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setRole($role): static
     {
-        if (isset($role) !== true) {
+        if (is_null($role)) {
             return $this;
         }
         $this->role = $role;
diff --git a/src/OpenSearch/Endpoints/Security/GetRoleMapping.php b/src/OpenSearch/Endpoints/Security/GetRoleMapping.php
index b58d74ecb..58c39146f 100644
--- a/src/OpenSearch/Endpoints/Security/GetRoleMapping.php
+++ b/src/OpenSearch/Endpoints/Security/GetRoleMapping.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setRole($role): static
     {
-        if (isset($role) !== true) {
+        if (is_null($role)) {
             return $this;
         }
         $this->role = $role;
diff --git a/src/OpenSearch/Endpoints/Security/GetTenant.php b/src/OpenSearch/Endpoints/Security/GetTenant.php
index dcfd3c002..dbe7248d6 100644
--- a/src/OpenSearch/Endpoints/Security/GetTenant.php
+++ b/src/OpenSearch/Endpoints/Security/GetTenant.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setTenant($tenant): static
     {
-        if (isset($tenant) !== true) {
+        if (is_null($tenant)) {
             return $this;
         }
         $this->tenant = $tenant;
diff --git a/src/OpenSearch/Endpoints/Security/GetUser.php b/src/OpenSearch/Endpoints/Security/GetUser.php
index ec67393ae..5f96c4a81 100644
--- a/src/OpenSearch/Endpoints/Security/GetUser.php
+++ b/src/OpenSearch/Endpoints/Security/GetUser.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/GetUserLegacy.php b/src/OpenSearch/Endpoints/Security/GetUserLegacy.php
index f58bdf4d1..6207f73ae 100644
--- a/src/OpenSearch/Endpoints/Security/GetUserLegacy.php
+++ b/src/OpenSearch/Endpoints/Security/GetUserLegacy.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/PatchActionGroup.php b/src/OpenSearch/Endpoints/Security/PatchActionGroup.php
index 35e737aa9..658b19dd8 100644
--- a/src/OpenSearch/Endpoints/Security/PatchActionGroup.php
+++ b/src/OpenSearch/Endpoints/Security/PatchActionGroup.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setActionGroup($action_group): static
     {
-        if (isset($action_group) !== true) {
+        if (is_null($action_group)) {
             return $this;
         }
         $this->action_group = $action_group;
diff --git a/src/OpenSearch/Endpoints/Security/PatchActionGroups.php b/src/OpenSearch/Endpoints/Security/PatchActionGroups.php
index 53e84258c..6bdd042e6 100644
--- a/src/OpenSearch/Endpoints/Security/PatchActionGroups.php
+++ b/src/OpenSearch/Endpoints/Security/PatchActionGroups.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/PatchAllowlist.php b/src/OpenSearch/Endpoints/Security/PatchAllowlist.php
index bbd76c6fe..0499abac6 100644
--- a/src/OpenSearch/Endpoints/Security/PatchAllowlist.php
+++ b/src/OpenSearch/Endpoints/Security/PatchAllowlist.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/PatchAuditConfiguration.php b/src/OpenSearch/Endpoints/Security/PatchAuditConfiguration.php
index 3bcd2b91a..804ca2816 100644
--- a/src/OpenSearch/Endpoints/Security/PatchAuditConfiguration.php
+++ b/src/OpenSearch/Endpoints/Security/PatchAuditConfiguration.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/PatchConfiguration.php b/src/OpenSearch/Endpoints/Security/PatchConfiguration.php
index 7fb935e2f..48c38cc52 100644
--- a/src/OpenSearch/Endpoints/Security/PatchConfiguration.php
+++ b/src/OpenSearch/Endpoints/Security/PatchConfiguration.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/PatchDistinguishedName.php b/src/OpenSearch/Endpoints/Security/PatchDistinguishedName.php
index 419d22cb0..172c4d033 100644
--- a/src/OpenSearch/Endpoints/Security/PatchDistinguishedName.php
+++ b/src/OpenSearch/Endpoints/Security/PatchDistinguishedName.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setClusterName($cluster_name): static
     {
-        if (isset($cluster_name) !== true) {
+        if (is_null($cluster_name)) {
             return $this;
         }
         $this->cluster_name = $cluster_name;
diff --git a/src/OpenSearch/Endpoints/Security/PatchDistinguishedNames.php b/src/OpenSearch/Endpoints/Security/PatchDistinguishedNames.php
index 280dd322b..3f4de031a 100644
--- a/src/OpenSearch/Endpoints/Security/PatchDistinguishedNames.php
+++ b/src/OpenSearch/Endpoints/Security/PatchDistinguishedNames.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/PatchRole.php b/src/OpenSearch/Endpoints/Security/PatchRole.php
index 432817e7b..45794701e 100644
--- a/src/OpenSearch/Endpoints/Security/PatchRole.php
+++ b/src/OpenSearch/Endpoints/Security/PatchRole.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setRole($role): static
     {
-        if (isset($role) !== true) {
+        if (is_null($role)) {
             return $this;
         }
         $this->role = $role;
diff --git a/src/OpenSearch/Endpoints/Security/PatchRoleMapping.php b/src/OpenSearch/Endpoints/Security/PatchRoleMapping.php
index b593f2bc6..824a20a2a 100644
--- a/src/OpenSearch/Endpoints/Security/PatchRoleMapping.php
+++ b/src/OpenSearch/Endpoints/Security/PatchRoleMapping.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setRole($role): static
     {
-        if (isset($role) !== true) {
+        if (is_null($role)) {
             return $this;
         }
         $this->role = $role;
diff --git a/src/OpenSearch/Endpoints/Security/PatchRoleMappings.php b/src/OpenSearch/Endpoints/Security/PatchRoleMappings.php
index 29ef48b5b..33efe6c72 100644
--- a/src/OpenSearch/Endpoints/Security/PatchRoleMappings.php
+++ b/src/OpenSearch/Endpoints/Security/PatchRoleMappings.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/PatchRoles.php b/src/OpenSearch/Endpoints/Security/PatchRoles.php
index cb1bb3b46..faedd90df 100644
--- a/src/OpenSearch/Endpoints/Security/PatchRoles.php
+++ b/src/OpenSearch/Endpoints/Security/PatchRoles.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/PatchTenant.php b/src/OpenSearch/Endpoints/Security/PatchTenant.php
index a3902d56d..95ad22bbb 100644
--- a/src/OpenSearch/Endpoints/Security/PatchTenant.php
+++ b/src/OpenSearch/Endpoints/Security/PatchTenant.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setTenant($tenant): static
     {
-        if (isset($tenant) !== true) {
+        if (is_null($tenant)) {
             return $this;
         }
         $this->tenant = $tenant;
diff --git a/src/OpenSearch/Endpoints/Security/PatchTenants.php b/src/OpenSearch/Endpoints/Security/PatchTenants.php
index 1f6b71a83..05e931a55 100644
--- a/src/OpenSearch/Endpoints/Security/PatchTenants.php
+++ b/src/OpenSearch/Endpoints/Security/PatchTenants.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/PatchUser.php b/src/OpenSearch/Endpoints/Security/PatchUser.php
index b15e8471e..5b24d87c0 100644
--- a/src/OpenSearch/Endpoints/Security/PatchUser.php
+++ b/src/OpenSearch/Endpoints/Security/PatchUser.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setUsername($username): static
     {
-        if (isset($username) !== true) {
+        if (is_null($username)) {
             return $this;
         }
         $this->username = $username;
diff --git a/src/OpenSearch/Endpoints/Security/PatchUsers.php b/src/OpenSearch/Endpoints/Security/PatchUsers.php
index 8b61f6585..6a5ba80f6 100644
--- a/src/OpenSearch/Endpoints/Security/PatchUsers.php
+++ b/src/OpenSearch/Endpoints/Security/PatchUsers.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/UpdateAuditConfiguration.php b/src/OpenSearch/Endpoints/Security/UpdateAuditConfiguration.php
index c5e6824a7..c75d1c4e4 100644
--- a/src/OpenSearch/Endpoints/Security/UpdateAuditConfiguration.php
+++ b/src/OpenSearch/Endpoints/Security/UpdateAuditConfiguration.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/UpdateConfiguration.php b/src/OpenSearch/Endpoints/Security/UpdateConfiguration.php
index b0862fd1b..9b5192d95 100644
--- a/src/OpenSearch/Endpoints/Security/UpdateConfiguration.php
+++ b/src/OpenSearch/Endpoints/Security/UpdateConfiguration.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Security/UpdateDistinguishedName.php b/src/OpenSearch/Endpoints/Security/UpdateDistinguishedName.php
index 25d8f1384..4f56599dd 100644
--- a/src/OpenSearch/Endpoints/Security/UpdateDistinguishedName.php
+++ b/src/OpenSearch/Endpoints/Security/UpdateDistinguishedName.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setClusterName($cluster_name): static
     {
-        if (isset($cluster_name) !== true) {
+        if (is_null($cluster_name)) {
             return $this;
         }
         $this->cluster_name = $cluster_name;
diff --git a/src/OpenSearch/Endpoints/Sm/CreatePolicy.php b/src/OpenSearch/Endpoints/Sm/CreatePolicy.php
index 9d069d83a..47125342a 100644
--- a/src/OpenSearch/Endpoints/Sm/CreatePolicy.php
+++ b/src/OpenSearch/Endpoints/Sm/CreatePolicy.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -62,7 +62,7 @@ public function setBody($body): static
 
     public function setPolicyName($policy_name): static
     {
-        if (isset($policy_name) !== true) {
+        if (is_null($policy_name)) {
             return $this;
         }
         $this->policy_name = $policy_name;
diff --git a/src/OpenSearch/Endpoints/Sm/DeletePolicy.php b/src/OpenSearch/Endpoints/Sm/DeletePolicy.php
index b342d8e37..83d3a3384 100644
--- a/src/OpenSearch/Endpoints/Sm/DeletePolicy.php
+++ b/src/OpenSearch/Endpoints/Sm/DeletePolicy.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setPolicyName($policy_name): static
     {
-        if (isset($policy_name) !== true) {
+        if (is_null($policy_name)) {
             return $this;
         }
         $this->policy_name = $policy_name;
diff --git a/src/OpenSearch/Endpoints/Sm/ExplainPolicy.php b/src/OpenSearch/Endpoints/Sm/ExplainPolicy.php
index 2396b3a7c..d48b223b2 100644
--- a/src/OpenSearch/Endpoints/Sm/ExplainPolicy.php
+++ b/src/OpenSearch/Endpoints/Sm/ExplainPolicy.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setPolicyName($policy_name): static
     {
-        if (isset($policy_name) !== true) {
+        if (is_null($policy_name)) {
             return $this;
         }
         $this->policy_name = $policy_name;
diff --git a/src/OpenSearch/Endpoints/Sm/GetPolicy.php b/src/OpenSearch/Endpoints/Sm/GetPolicy.php
index dc59eeaf7..9ed27349b 100644
--- a/src/OpenSearch/Endpoints/Sm/GetPolicy.php
+++ b/src/OpenSearch/Endpoints/Sm/GetPolicy.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setPolicyName($policy_name): static
     {
-        if (isset($policy_name) !== true) {
+        if (is_null($policy_name)) {
             return $this;
         }
         $this->policy_name = $policy_name;
diff --git a/src/OpenSearch/Endpoints/Sm/StartPolicy.php b/src/OpenSearch/Endpoints/Sm/StartPolicy.php
index ece11dad5..10252995f 100644
--- a/src/OpenSearch/Endpoints/Sm/StartPolicy.php
+++ b/src/OpenSearch/Endpoints/Sm/StartPolicy.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setPolicyName($policy_name): static
     {
-        if (isset($policy_name) !== true) {
+        if (is_null($policy_name)) {
             return $this;
         }
         $this->policy_name = $policy_name;
diff --git a/src/OpenSearch/Endpoints/Sm/StopPolicy.php b/src/OpenSearch/Endpoints/Sm/StopPolicy.php
index 35e82af69..f8bdd18a6 100644
--- a/src/OpenSearch/Endpoints/Sm/StopPolicy.php
+++ b/src/OpenSearch/Endpoints/Sm/StopPolicy.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setPolicyName($policy_name): static
     {
-        if (isset($policy_name) !== true) {
+        if (is_null($policy_name)) {
             return $this;
         }
         $this->policy_name = $policy_name;
diff --git a/src/OpenSearch/Endpoints/Sm/UpdatePolicy.php b/src/OpenSearch/Endpoints/Sm/UpdatePolicy.php
index dc0950b65..ad0d39fd3 100644
--- a/src/OpenSearch/Endpoints/Sm/UpdatePolicy.php
+++ b/src/OpenSearch/Endpoints/Sm/UpdatePolicy.php
@@ -54,7 +54,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -64,7 +64,7 @@ public function setBody($body): static
 
     public function setPolicyName($policy_name): static
     {
-        if (isset($policy_name) !== true) {
+        if (is_null($policy_name)) {
             return $this;
         }
         $this->policy_name = $policy_name;
diff --git a/src/OpenSearch/Endpoints/Snapshot/CleanupRepository.php b/src/OpenSearch/Endpoints/Snapshot/CleanupRepository.php
index 33800a060..94c9bfea1 100644
--- a/src/OpenSearch/Endpoints/Snapshot/CleanupRepository.php
+++ b/src/OpenSearch/Endpoints/Snapshot/CleanupRepository.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
diff --git a/src/OpenSearch/Endpoints/Snapshot/CloneSnapshot.php b/src/OpenSearch/Endpoints/Snapshot/CloneSnapshot.php
index 2d4523301..e9b0997c9 100644
--- a/src/OpenSearch/Endpoints/Snapshot/CloneSnapshot.php
+++ b/src/OpenSearch/Endpoints/Snapshot/CloneSnapshot.php
@@ -64,7 +64,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -74,7 +74,7 @@ public function setBody($body): static
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
@@ -84,7 +84,7 @@ public function setRepository($repository): static
 
     public function setSnapshot($snapshot): static
     {
-        if (isset($snapshot) !== true) {
+        if (is_null($snapshot)) {
             return $this;
         }
         $this->snapshot = $snapshot;
@@ -94,7 +94,7 @@ public function setSnapshot($snapshot): static
 
     public function setTargetSnapshot($target_snapshot): static
     {
-        if (isset($target_snapshot) !== true) {
+        if (is_null($target_snapshot)) {
             return $this;
         }
         $this->target_snapshot = $target_snapshot;
diff --git a/src/OpenSearch/Endpoints/Snapshot/Create.php b/src/OpenSearch/Endpoints/Snapshot/Create.php
index 63c5ea70f..f296b2ace 100644
--- a/src/OpenSearch/Endpoints/Snapshot/Create.php
+++ b/src/OpenSearch/Endpoints/Snapshot/Create.php
@@ -63,7 +63,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -73,7 +73,7 @@ public function setBody($body): static
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
@@ -83,7 +83,7 @@ public function setRepository($repository): static
 
     public function setSnapshot($snapshot): static
     {
-        if (isset($snapshot) !== true) {
+        if (is_null($snapshot)) {
             return $this;
         }
         $this->snapshot = $snapshot;
diff --git a/src/OpenSearch/Endpoints/Snapshot/CreateRepository.php b/src/OpenSearch/Endpoints/Snapshot/CreateRepository.php
index 5d5f7ef6e..c1974fa45 100644
--- a/src/OpenSearch/Endpoints/Snapshot/CreateRepository.php
+++ b/src/OpenSearch/Endpoints/Snapshot/CreateRepository.php
@@ -62,7 +62,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -72,7 +72,7 @@ public function setBody($body): static
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
diff --git a/src/OpenSearch/Endpoints/Snapshot/Delete.php b/src/OpenSearch/Endpoints/Snapshot/Delete.php
index 9dd2492ac..876490e16 100644
--- a/src/OpenSearch/Endpoints/Snapshot/Delete.php
+++ b/src/OpenSearch/Endpoints/Snapshot/Delete.php
@@ -62,7 +62,7 @@ public function getMethod(): string
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
@@ -72,7 +72,7 @@ public function setRepository($repository): static
 
     public function setSnapshot($snapshot): static
     {
-        if (isset($snapshot) !== true) {
+        if (is_null($snapshot)) {
             return $this;
         }
         $this->snapshot = $snapshot;
diff --git a/src/OpenSearch/Endpoints/Snapshot/Get.php b/src/OpenSearch/Endpoints/Snapshot/Get.php
index 6951e15f8..51fc607b2 100644
--- a/src/OpenSearch/Endpoints/Snapshot/Get.php
+++ b/src/OpenSearch/Endpoints/Snapshot/Get.php
@@ -64,7 +64,7 @@ public function getMethod(): string
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
diff --git a/src/OpenSearch/Endpoints/Snapshot/Restore.php b/src/OpenSearch/Endpoints/Snapshot/Restore.php
index 9c30e67aa..ca6d614e1 100644
--- a/src/OpenSearch/Endpoints/Snapshot/Restore.php
+++ b/src/OpenSearch/Endpoints/Snapshot/Restore.php
@@ -63,7 +63,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -73,7 +73,7 @@ public function setBody($body): static
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
@@ -83,7 +83,7 @@ public function setRepository($repository): static
 
     public function setSnapshot($snapshot): static
     {
-        if (isset($snapshot) !== true) {
+        if (is_null($snapshot)) {
             return $this;
         }
         $this->snapshot = $snapshot;
diff --git a/src/OpenSearch/Endpoints/Snapshot/Status.php b/src/OpenSearch/Endpoints/Snapshot/Status.php
index d894ce8c4..b73cb8e0f 100644
--- a/src/OpenSearch/Endpoints/Snapshot/Status.php
+++ b/src/OpenSearch/Endpoints/Snapshot/Status.php
@@ -65,7 +65,7 @@ public function getMethod(): string
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
diff --git a/src/OpenSearch/Endpoints/Snapshot/VerifyRepository.php b/src/OpenSearch/Endpoints/Snapshot/VerifyRepository.php
index 4c8b0f871..e3d765ed7 100644
--- a/src/OpenSearch/Endpoints/Snapshot/VerifyRepository.php
+++ b/src/OpenSearch/Endpoints/Snapshot/VerifyRepository.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setRepository($repository): static
     {
-        if (isset($repository) !== true) {
+        if (is_null($repository)) {
             return $this;
         }
         $this->repository = $repository;
diff --git a/src/OpenSearch/Endpoints/Sql/Close.php b/src/OpenSearch/Endpoints/Sql/Close.php
index dd9f8d32e..7bf12b557 100644
--- a/src/OpenSearch/Endpoints/Sql/Close.php
+++ b/src/OpenSearch/Endpoints/Sql/Close.php
@@ -47,7 +47,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Sql/Explain.php b/src/OpenSearch/Endpoints/Sql/Explain.php
index c7380165c..82ddc4c7d 100644
--- a/src/OpenSearch/Endpoints/Sql/Explain.php
+++ b/src/OpenSearch/Endpoints/Sql/Explain.php
@@ -47,7 +47,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Sql/PostStats.php b/src/OpenSearch/Endpoints/Sql/PostStats.php
index 4e1073ddc..cf3b297e2 100644
--- a/src/OpenSearch/Endpoints/Sql/PostStats.php
+++ b/src/OpenSearch/Endpoints/Sql/PostStats.php
@@ -47,7 +47,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Sql/Query.php b/src/OpenSearch/Endpoints/Sql/Query.php
index 47d3699e2..e4a362c1a 100644
--- a/src/OpenSearch/Endpoints/Sql/Query.php
+++ b/src/OpenSearch/Endpoints/Sql/Query.php
@@ -47,7 +47,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Sql/Settings.php b/src/OpenSearch/Endpoints/Sql/Settings.php
index 5872d364d..78fc51f58 100644
--- a/src/OpenSearch/Endpoints/Sql/Settings.php
+++ b/src/OpenSearch/Endpoints/Sql/Settings.php
@@ -46,7 +46,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Tasks/Cancel.php b/src/OpenSearch/Endpoints/Tasks/Cancel.php
index 2d578c53b..f5b6f6f1f 100644
--- a/src/OpenSearch/Endpoints/Tasks/Cancel.php
+++ b/src/OpenSearch/Endpoints/Tasks/Cancel.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setTaskId($task_id): static
     {
-        if (isset($task_id) !== true) {
+        if (is_null($task_id)) {
             return $this;
         }
         $this->task_id = $task_id;
diff --git a/src/OpenSearch/Endpoints/Tasks/Get.php b/src/OpenSearch/Endpoints/Tasks/Get.php
index 198941aba..e6166abfc 100644
--- a/src/OpenSearch/Endpoints/Tasks/Get.php
+++ b/src/OpenSearch/Endpoints/Tasks/Get.php
@@ -60,7 +60,7 @@ public function getMethod(): string
 
     public function setTaskId($task_id): static
     {
-        if (isset($task_id) !== true) {
+        if (is_null($task_id)) {
             return $this;
         }
         $this->task_id = $task_id;
diff --git a/src/OpenSearch/Endpoints/TermVectors.php b/src/OpenSearch/Endpoints/TermVectors.php
index 7a35caf12..1df0753de 100644
--- a/src/OpenSearch/Endpoints/TermVectors.php
+++ b/src/OpenSearch/Endpoints/TermVectors.php
@@ -73,7 +73,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Transforms/Preview.php b/src/OpenSearch/Endpoints/Transforms/Preview.php
index 167422e50..fe27bf909 100644
--- a/src/OpenSearch/Endpoints/Transforms/Preview.php
+++ b/src/OpenSearch/Endpoints/Transforms/Preview.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Transforms/Put.php b/src/OpenSearch/Endpoints/Transforms/Put.php
index 5230fc884..b5fc4e1e4 100644
--- a/src/OpenSearch/Endpoints/Transforms/Put.php
+++ b/src/OpenSearch/Endpoints/Transforms/Put.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Update.php b/src/OpenSearch/Endpoints/Update.php
index a45d4ee22..d1caf4aba 100644
--- a/src/OpenSearch/Endpoints/Update.php
+++ b/src/OpenSearch/Endpoints/Update.php
@@ -76,7 +76,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/UpdateByQuery.php b/src/OpenSearch/Endpoints/UpdateByQuery.php
index 627176dd9..e25d32967 100644
--- a/src/OpenSearch/Endpoints/UpdateByQuery.php
+++ b/src/OpenSearch/Endpoints/UpdateByQuery.php
@@ -92,7 +92,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/UpdateByQueryRethrottle.php b/src/OpenSearch/Endpoints/UpdateByQueryRethrottle.php
index 1281a1ab7..17173715d 100644
--- a/src/OpenSearch/Endpoints/UpdateByQueryRethrottle.php
+++ b/src/OpenSearch/Endpoints/UpdateByQueryRethrottle.php
@@ -61,7 +61,7 @@ public function getMethod(): string
 
     public function setTaskId($task_id): static
     {
-        if (isset($task_id) !== true) {
+        if (is_null($task_id)) {
             return $this;
         }
         $this->task_id = $task_id;
diff --git a/src/OpenSearch/Endpoints/Wlm/CreateQueryGroup.php b/src/OpenSearch/Endpoints/Wlm/CreateQueryGroup.php
index 299d98256..bb902b601 100644
--- a/src/OpenSearch/Endpoints/Wlm/CreateQueryGroup.php
+++ b/src/OpenSearch/Endpoints/Wlm/CreateQueryGroup.php
@@ -45,7 +45,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
diff --git a/src/OpenSearch/Endpoints/Wlm/DeleteQueryGroup.php b/src/OpenSearch/Endpoints/Wlm/DeleteQueryGroup.php
index 8a7cda794..8b63c9539 100644
--- a/src/OpenSearch/Endpoints/Wlm/DeleteQueryGroup.php
+++ b/src/OpenSearch/Endpoints/Wlm/DeleteQueryGroup.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Wlm/GetQueryGroup.php b/src/OpenSearch/Endpoints/Wlm/GetQueryGroup.php
index 5db7e0319..1c6b7e9cf 100644
--- a/src/OpenSearch/Endpoints/Wlm/GetQueryGroup.php
+++ b/src/OpenSearch/Endpoints/Wlm/GetQueryGroup.php
@@ -51,7 +51,7 @@ public function getMethod(): string
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Endpoints/Wlm/UpdateQueryGroup.php b/src/OpenSearch/Endpoints/Wlm/UpdateQueryGroup.php
index 2c437c425..49e32ba83 100644
--- a/src/OpenSearch/Endpoints/Wlm/UpdateQueryGroup.php
+++ b/src/OpenSearch/Endpoints/Wlm/UpdateQueryGroup.php
@@ -52,7 +52,7 @@ public function getMethod(): string
 
     public function setBody($body): static
     {
-        if (isset($body) !== true) {
+        if (is_null($body)) {
             return $this;
         }
         $this->body = $body;
@@ -62,7 +62,7 @@ public function setBody($body): static
 
     public function setName($name): static
     {
-        if (isset($name) !== true) {
+        if (is_null($name)) {
             return $this;
         }
         $this->name = $name;
diff --git a/src/OpenSearch/Namespaces/AsynchronousSearchNamespace.php b/src/OpenSearch/Namespaces/AsynchronousSearchNamespace.php
index 2fc491192..9922a808c 100644
--- a/src/OpenSearch/Namespaces/AsynchronousSearchNamespace.php
+++ b/src/OpenSearch/Namespaces/AsynchronousSearchNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class AsynchronousSearchNamespace
  *
diff --git a/src/OpenSearch/Namespaces/CatNamespace.php b/src/OpenSearch/Namespaces/CatNamespace.php
index 1911ce8de..f1503a8f7 100644
--- a/src/OpenSearch/Namespaces/CatNamespace.php
+++ b/src/OpenSearch/Namespaces/CatNamespace.php
@@ -21,8 +21,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class CatNamespace
  *
@@ -31,7 +29,7 @@
 class CatNamespace extends AbstractNamespace
 {
     /**
-     * Shows information about currently configured aliases to indexes including filter and routing info.
+     * Shows information about aliases currently configured to indexes, including filter and routing information.
      *
      * $params['name']             = (array) A comma-separated list of aliases to retrieve. Supports wildcards (`*`).  To retrieve all aliases, omit this parameter or use `*` or `_all`.
      * $params['expand_wildcards'] = (any) Expands wildcard expressions to concrete indexes. Combine multiple values with commas. Supported values are `all`, `open`, `closed`, `hidden`, and `none`.
@@ -62,14 +60,14 @@ public function aliases(array $params = [])
     }
 
     /**
-     * Lists all active point-in-time segments.
+     * Lists all active CAT point-in-time segments.
      *
-     * $params['bytes']       = (enum) The unit in which to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['format']      = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']           = (array) Comma-separated list of column names to display.
+     * $params['bytes']       = (any) The units used to display byte values.
+     * $params['format']      = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']           = (array) A comma-separated list of column names to display.
      * $params['help']        = (boolean) Return help information. (Default = false)
-     * $params['s']           = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']           = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['s']           = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']           = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -91,7 +89,7 @@ public function allPitSegments(array $params = [])
      * Provides a snapshot of how many shards are allocated to each data node and how much disk space they are using.
      *
      * $params['node_id']                 = (array) A comma-separated list of node IDs or names used to limit the returned information.
-     * $params['bytes']                   = (enum) The units used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
+     * $params['bytes']                   = (any) The units used to display byte values.
      * $params['cluster_manager_timeout'] = (string) A timeout for connection to the cluster manager node.
      * $params['format']                  = (string) A short version of the HTTP `Accept` header, such as `json` or `yaml`.
      * $params['h']                       = (array) A comma-separated list of column names to display.
@@ -127,7 +125,7 @@ public function allocation(array $params = [])
      * $params['format']                  = (string) A short version of the HTTP `Accept` header, such as `json` or `yaml`.
      * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
      * $params['master_timeout']          = (string) A timeout for connection to the cluster manager node.
      * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
      * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
@@ -149,14 +147,14 @@ public function clusterManager(array $params = [])
     }
 
     /**
-     * Provides quick access to the document count of the entire cluster, or individual indexes.
+     * Provides quick access to the document count of the entire cluster or of an individual index.
      *
      * $params['index']       = (array) Comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
-     * $params['format']      = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']           = (array) Comma-separated list of column names to display.
+     * $params['format']      = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']           = (array) A comma-separated list of column names to display.
      * $params['help']        = (boolean) Return help information. (Default = false)
-     * $params['s']           = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']           = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['s']           = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']           = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -180,13 +178,13 @@ public function count(array $params = [])
     /**
      * Shows how much heap memory is currently being used by field data on every data node in the cluster.
      *
-     * $params['fields']      = (array) Comma-separated list of fields used to limit returned information. To retrieve all fields, omit this parameter.
-     * $params['bytes']       = (enum) The unit used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['format']      = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']           = (array) Comma-separated list of column names to display.
+     * $params['fields']      = (array) A comma-separated list of fields used to limit the amount of returned information. To retrieve all fields, omit this parameter.
+     * $params['bytes']       = (any) The units used to display byte values.
+     * $params['format']      = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']           = (array) A comma-separated list of column names to display.
      * $params['help']        = (boolean) Return help information. (Default = false)
-     * $params['s']           = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']           = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['s']           = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']           = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -210,13 +208,13 @@ public function fielddata(array $params = [])
     /**
      * Returns a concise representation of the cluster health.
      *
-     * $params['format']      = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']           = (array) Comma-separated list of column names to display.
+     * $params['format']      = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']           = (array) A comma-separated list of column names to display.
      * $params['help']        = (boolean) Return help information. (Default = false)
-     * $params['s']           = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['time']        = (enum) The unit used to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['ts']          = (boolean) If `true`, returns `HH:MM:SS` and Unix epoch timestamps. (Default = true)
-     * $params['v']           = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['s']           = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['time']        = (any) The unit used to display time values.
+     * $params['ts']          = (boolean) When `true`, returns `HH:MM:SS` and Unix epoch timestamps. (Default = true)
+     * $params['v']           = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -255,23 +253,23 @@ public function help(array $params = [])
     }
 
     /**
-     * Returns information about indexes: number of primaries and replicas, document counts, disk size, ...
+     * Lists information related to indexes, that is, how much disk space they are using, how many shards they have, their health status, and so on.
      *
-     * $params['index']                     = (array) Comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
-     * $params['bytes']                     = (enum) The unit used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['cluster_manager_timeout']   = (string) Operation timeout for connection to cluster-manager node.
+     * $params['index']                     = (array) A comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
+     * $params['bytes']                     = (any) The units used to display byte values.
+     * $params['cluster_manager_timeout']   = (string) The amount of time allowed to establish a connection to the cluster manager node.
      * $params['expand_wildcards']          = (any) The type of index that wildcard patterns can match.
-     * $params['format']                    = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                         = (array) Comma-separated list of column names to display.
-     * $params['health']                    = (any) The health status used to limit returned indexes. By default, the response includes indexes of any health status.
+     * $params['format']                    = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                         = (array) A comma-separated list of column names to display.
+     * $params['health']                    = (any) Limits indexes based on their health status. Supported values are `green`, `yellow`, and `red`.
      * $params['help']                      = (boolean) Return help information. (Default = false)
-     * $params['include_unloaded_segments'] = (boolean) If `true`, the response includes information from segments that are not loaded into memory. (Default = false)
-     * $params['local']                     = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']            = (string) Operation timeout for connection to cluster-manager node.
-     * $params['pri']                       = (boolean) If `true`, the response only includes information from primary shards. (Default = false)
-     * $params['s']                         = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['time']                      = (enum) The unit used to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['v']                         = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['include_unloaded_segments'] = (boolean) Whether to include information from segments not loaded into memory. (Default = false)
+     * $params['local']                     = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']            = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['pri']                       = (boolean) When `true`, returns information only from the primary shards. (Default = false)
+     * $params['s']                         = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['time']                      = (any) Specifies the time units.
+     * $params['v']                         = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                    = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                     = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']               = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -295,14 +293,14 @@ public function indices(array $params = [])
     /**
      * Returns information about the cluster-manager node.
      *
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -323,14 +321,14 @@ public function master(array $params = [])
     /**
      * Returns information about custom node attributes.
      *
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -349,19 +347,19 @@ public function nodeattrs(array $params = [])
     }
 
     /**
-     * Returns basic statistics about performance of cluster nodes.
+     * Returns basic statistics about the performance of cluster nodes.
      *
-     * $params['bytes']                   = (enum) The unit used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['full_id']                 = (any) If `true`, return the full node ID. If `false`, return the shortened node ID. (Default = )
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['bytes']                   = (any) The units used to display byte values.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['full_id']                 = (any) When `true`, returns the full node ID. When `false`, returns the shortened node ID.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['time']                    = (enum) The unit in which to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['time']                    = (any) Specifies the time units, for example, `5d` or `7h`. For more information, see [Supported units](https://opensearch.org/docs/latest/api-reference/units/).
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -380,17 +378,17 @@ public function nodes(array $params = [])
     }
 
     /**
-     * Returns a concise representation of the cluster pending tasks.
+     * Returns a concise representation of the cluster's pending tasks.
      *
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['time']                    = (enum) The unit in which to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['time']                    = (any) Specifies the time units, for example, `5d` or `7h`. For more information, see [Supported units](https://opensearch.org/docs/latest/api-reference/units/).
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -409,14 +407,14 @@ public function pendingTasks(array $params = [])
     }
 
     /**
-     * List segments for one or several PITs.
+     * Lists one or several CAT point-in-time segments.
      *
-     * $params['bytes']       = (enum) The unit in which to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['format']      = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']           = (array) Comma-separated list of column names to display.
+     * $params['bytes']       = (any) The units used to display byte values.
+     * $params['format']      = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']           = (array) A comma-separated list of column names to display.
      * $params['help']        = (boolean) Return help information. (Default = false)
-     * $params['s']           = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']           = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['s']           = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']           = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -438,16 +436,16 @@ public function pitSegments(array $params = [])
     }
 
     /**
-     * Returns information about installed plugins across nodes node.
+     * Returns information about the names, components, and versions of the installed plugins.
      *
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -466,18 +464,18 @@ public function plugins(array $params = [])
     }
 
     /**
-     * Returns information about index shard recoveries, both on-going completed.
+     * Returns all completed and ongoing index and shard recoveries.
      *
      * $params['index']       = (array) A comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
      * $params['active_only'] = (boolean) If `true`, the response only includes ongoing shard recoveries. (Default = false)
-     * $params['bytes']       = (enum) The unit used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['detailed']    = (boolean) If `true`, the response includes detailed information about shard recoveries. (Default = false)
-     * $params['format']      = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']           = (array) Comma-separated list of column names to display.
+     * $params['bytes']       = (any) The units used to display byte values.
+     * $params['detailed']    = (boolean) When `true`, includes detailed information about shard recoveries. (Default = false)
+     * $params['format']      = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']           = (array) A comma-separated list of column names to display.
      * $params['help']        = (boolean) Return help information. (Default = false)
-     * $params['s']           = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['time']        = (enum) The unit in which to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['v']           = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['s']           = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['time']        = (any) Specifies the time units, for example, `5d` or `7h`. For more information, see [Supported units](https://opensearch.org/docs/latest/api-reference/units/).
+     * $params['v']           = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -499,16 +497,16 @@ public function recovery(array $params = [])
     }
 
     /**
-     * Returns information about snapshot repositories registered in the cluster.
+     * Returns information about all snapshot repositories for a cluster.
      *
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -527,25 +525,25 @@ public function repositories(array $params = [])
     }
 
     /**
-     * Returns information about both on-going and latest completed Segment Replication events.
-     *
-     * $params['index']              = (array) Comma-separated list or wildcard expression of index names to limit the returned information.
-     * $params['active_only']        = (boolean) If `true`, the response only includes ongoing segment replication events. (Default = false)
-     * $params['allow_no_indices']   = (boolean) Whether to ignore if a wildcard indexes expression resolves into no concrete indexes. (This includes `_all` string or when no indexes have been specified).
-     * $params['bytes']              = (enum) The unit in which to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['completed_only']     = (boolean) If `true`, the response only includes latest completed segment replication events. (Default = false)
-     * $params['detailed']           = (boolean) If `true`, the response includes detailed information about segment replications. (Default = false)
-     * $params['expand_wildcards']   = (any) Whether to expand wildcard expression to concrete indexes that are open, closed or both.
-     * $params['format']             = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                  = (array) Comma-separated list of column names to display.
+     * Returns information about active and last-completed segment replication events on each replica shard, including related shard-level metrics. These metrics provide information about how far behind the primary shard the replicas are lagging.
+     *
+     * $params['index']              = (array) A comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
+     * $params['active_only']        = (boolean) When `true`, the response only includes ongoing segment replication events. (Default = false)
+     * $params['allow_no_indices']   = (boolean) Whether to ignore the index if a wildcard index expression resolves to no concrete indexes. This includes the `_all` string or when no indexes have been specified.
+     * $params['bytes']              = (any) The units used to display byte values.
+     * $params['completed_only']     = (boolean) When `true`, the response only includes the last-completed segment replication events. (Default = false)
+     * $params['detailed']           = (boolean) When `true`, the response includes additional metrics for each stage of a segment replication event. (Default = false)
+     * $params['expand_wildcards']   = (any) Whether to expand the wildcard expression to include concrete indexes that are open, closed, or both.
+     * $params['format']             = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                  = (array) A comma-separated list of column names to display.
      * $params['help']               = (boolean) Return help information. (Default = false)
-     * $params['ignore_throttled']   = (boolean) Whether specified concrete, expanded or aliased indexes should be ignored when throttled.
-     * $params['ignore_unavailable'] = (boolean) Whether specified concrete indexes should be ignored when unavailable (missing or closed).
-     * $params['s']                  = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['shards']             = (array) Comma-separated list of shards to display.
-     * $params['time']               = (enum) The unit in which to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['timeout']            = (string) Operation timeout.
-     * $params['v']                  = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['ignore_throttled']   = (boolean) Whether specified concrete, expanded, or aliased indexes should be ignored when throttled.
+     * $params['ignore_unavailable'] = (boolean) Whether the specified concrete indexes should be ignored when missing or closed.
+     * $params['s']                  = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['shards']             = (array) A comma-separated list of shards to display.
+     * $params['time']               = (any) Specifies the time units, for example, `5d` or `7h`. For more information, see [Supported units](https://opensearch.org/docs/latest/api-reference/units/).
+     * $params['timeout']            = (string) The operation timeout.
+     * $params['v']                  = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']             = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']              = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']        = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -570,14 +568,14 @@ public function segmentReplication(array $params = [])
      * Provides low-level information about the segments in the shards of an index.
      *
      * $params['index']                   = (array) A comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
-     * $params['bytes']                   = (enum) The unit used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
-     * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['bytes']                   = (any) The units used to display byte values.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
+     * $params['help']                    = (boolean) Returns help information. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -599,19 +597,19 @@ public function segments(array $params = [])
     }
 
     /**
-     * Provides a detailed view of shard allocation on nodes.
+     * Lists the states of all primary and replica shards and how they are distributed.
      *
      * $params['index']                   = (array) A comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
-     * $params['bytes']                   = (enum) The unit used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['bytes']                   = (any) The units used to display byte values.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['time']                    = (enum) The unit in which to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['time']                    = (any) Specifies the time units, for example, `5d` or `7h`. For more information, see [Supported units](https://opensearch.org/docs/latest/api-reference/units/).
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -633,18 +631,18 @@ public function shards(array $params = [])
     }
 
     /**
-     * Returns all snapshots in a specific repository.
+     * Lists all of the snapshots stored in a specific repository.
      *
      * $params['repository']              = (array) A comma-separated list of snapshot repositories used to limit the request. Accepts wildcard expressions. `_all` returns all repositories. If any repository fails during the request, OpenSearch returns an error.
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['ignore_unavailable']      = (boolean) If `true`, the response does not include information from unavailable snapshots. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['time']                    = (enum) The unit in which to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['ignore_unavailable']      = (boolean) When `true`, the response does not include information from unavailable snapshots. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['time']                    = (any) Specifies the time units, for example, `5d` or `7h`. For more information, see [Supported units](https://opensearch.org/docs/latest/api-reference/units/).
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -666,22 +664,22 @@ public function snapshots(array $params = [])
     }
 
     /**
-     * Returns information about the tasks currently executing on one or more nodes in the cluster.
+     * Lists the progress of all tasks currently running on the cluster.
      *
-     * $params['actions']     = (array) The task action names, which are used to limit the response.
+     * $params['actions']     = (array) The task action names used to limit the response.
      * $params['detailed']    = (boolean) If `true`, the response includes detailed information about shard recoveries. (Default = false)
-     * $params['format']      = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']           = (array) Comma-separated list of column names to display.
+     * $params['format']      = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']           = (array) A comma-separated list of column names to display.
      * $params['help']        = (boolean) Return help information. (Default = false)
-     * $params['s']           = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['time']        = (enum) The unit in which to display time values. (Options = d,h,m,micros,ms,nanos,s)
-     * $params['v']           = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['s']           = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['time']        = (any) Specifies the time units, for example, `5d` or `7h`. For more information, see [Supported units](https://opensearch.org/docs/latest/api-reference/units/).
+     * $params['v']           = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
      * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
      * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
-     * $params['node_id']     = (array) Comma-separated list of node IDs or names to limit the returned information; use `_local` to return information from the node you're connecting to, leave empty to get information from all nodes.
+     * $params['node_id']     = (array) A comma-separated list of node IDs or names used to limit the returned information. Use `_local` to return information from the node to which you're connecting, specify a specific node from which to get information, or keep the parameter empty to get information from all nodes.
      * $params['parent_task'] = (string) The parent task identifier, which is used to limit the response.
      *
      * @param array $params Associative array of parameters
@@ -696,17 +694,17 @@ public function tasks(array $params = [])
     }
 
     /**
-     * Returns information about existing templates.
+     * Lists the names, patterns, order numbers, and version numbers of index templates.
      *
      * $params['name']                    = (string) The name of the template to return. Accepts wildcard expressions. If omitted, all templates are returned.
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['cluster_manager_timeout'] = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
@@ -728,18 +726,18 @@ public function templates(array $params = [])
     }
 
     /**
-     * Returns cluster-wide thread pool statistics per node.By default the active, queue and rejected statistics are returned for all thread pools.
+     * Returns cluster-wide thread pool statistics per node.By default the active, queued, and rejected statistics are returned for all thread pools.
      *
      * $params['thread_pool_patterns']    = (array) A comma-separated list of thread pool names used to limit the request. Accepts wildcard expressions.
-     * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
-     * $params['format']                  = (string) A short version of the Accept header (for example, `json`, `yaml`).
-     * $params['h']                       = (array) Comma-separated list of column names to display.
+     * $params['cluster_manager_timeout'] = (string) A timeout for connection to the cluster manager node.
+     * $params['format']                  = (string) A short version of the `Accept` header, such as `json` or `yaml`.
+     * $params['h']                       = (array) A comma-separated list of column names to display.
      * $params['help']                    = (boolean) Return help information. (Default = false)
-     * $params['local']                   = (boolean) Return local information, do not retrieve the state from cluster-manager node. (Default = false)
-     * $params['master_timeout']          = (string) Operation timeout for connection to cluster-manager node.
-     * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
+     * $params['local']                   = (boolean) Returns local information but does not retrieve the state from the cluster manager node. (Default = false)
+     * $params['master_timeout']          = (string) The amount of time allowed to establish a connection to the cluster manager node.
+     * $params['s']                       = (array) A comma-separated list of column names or column aliases to sort by.
      * $params['size']                    = (integer) The multiplier in which to display values.
-     * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
+     * $params['v']                       = (boolean) Enables verbose mode, which displays column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
      * $params['error_trace']             = (boolean) Whether to include the stack trace of returned errors. (Default = false)
diff --git a/src/OpenSearch/Namespaces/ClusterNamespace.php b/src/OpenSearch/Namespaces/ClusterNamespace.php
index 3ebcd0f86..dd9b5135a 100644
--- a/src/OpenSearch/Namespaces/ClusterNamespace.php
+++ b/src/OpenSearch/Namespaces/ClusterNamespace.php
@@ -21,8 +21,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class ClusterNamespace
  *
@@ -182,6 +180,7 @@ public function existsComponentTemplate(array $params = []): bool
      *
      * $params['name']                    = (array) Name of the component template to retrieve. Wildcard (`*`) expressions are supported.
      * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
+     * $params['flat_settings']           = (boolean) If `true`, returns settings in flat format. (Default = false)
      * $params['local']                   = (boolean) If `true`, the request retrieves information from the local node only.If `false`, information is retrieved from the cluster-manager node. (Default = false)
      * $params['master_timeout']          = (string) Period to wait for a connection to the cluster-manager node.If no response is received before the timeout expires, the request fails and returns an error.
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
diff --git a/src/OpenSearch/Namespaces/DanglingIndicesNamespace.php b/src/OpenSearch/Namespaces/DanglingIndicesNamespace.php
index 14fd9accd..fcc9c0f6b 100644
--- a/src/OpenSearch/Namespaces/DanglingIndicesNamespace.php
+++ b/src/OpenSearch/Namespaces/DanglingIndicesNamespace.php
@@ -21,8 +21,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class DanglingIndicesNamespace
  *
diff --git a/src/OpenSearch/Namespaces/FlowFrameworkNamespace.php b/src/OpenSearch/Namespaces/FlowFrameworkNamespace.php
index d758ad9e1..1a926267a 100644
--- a/src/OpenSearch/Namespaces/FlowFrameworkNamespace.php
+++ b/src/OpenSearch/Namespaces/FlowFrameworkNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class FlowFrameworkNamespace
  *
diff --git a/src/OpenSearch/Namespaces/IndicesNamespace.php b/src/OpenSearch/Namespaces/IndicesNamespace.php
index cd7b64b03..ffa64981f 100644
--- a/src/OpenSearch/Namespaces/IndicesNamespace.php
+++ b/src/OpenSearch/Namespaces/IndicesNamespace.php
@@ -21,8 +21,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class IndicesNamespace
  *
@@ -440,7 +438,7 @@ public function exists(array $params = []): bool
         $endpoint->setParams($params);
         $endpoint->setIndex($index);
 
-        return BooleanRequestWrapper::performRequest($endpoint, $this->transport);
+        return BooleanRequestWrapper::sendRequest($endpoint, $this->httpTransport);
     }
 
     /**
@@ -474,7 +472,7 @@ public function existsAlias(array $params = []): bool
         $endpoint->setName($name);
         $endpoint->setIndex($index);
 
-        return BooleanRequestWrapper::performRequest($endpoint, $this->transport);
+        return BooleanRequestWrapper::sendRequest($endpoint, $this->httpTransport);
     }
 
     /**
@@ -505,7 +503,7 @@ public function existsIndexTemplate(array $params = []): bool
         $endpoint->setParams($params);
         $endpoint->setName($name);
 
-        return BooleanRequestWrapper::performRequest($endpoint, $this->transport);
+        return BooleanRequestWrapper::sendRequest($endpoint, $this->httpTransport);
     }
 
     /**
@@ -536,7 +534,7 @@ public function existsTemplate(array $params = []): bool
         $endpoint->setParams($params);
         $endpoint->setName($name);
 
-        return BooleanRequestWrapper::performRequest($endpoint, $this->transport);
+        return BooleanRequestWrapper::sendRequest($endpoint, $this->httpTransport);
     }
 
     /**
@@ -576,7 +574,7 @@ public function flush(array $params = [])
      * $params['expand_wildcards']     = (any) Whether to expand wildcard expression to concrete indexes that are open, closed or both.
      * $params['flush']                = (boolean) Specify whether the index should be flushed after performing the operation. (Default = true)
      * $params['ignore_unavailable']   = (boolean) Whether specified concrete indexes should be ignored when unavailable (missing or closed)
-     * $params['max_num_segments']     = (number) The number of larger segments into which smaller segments are merged.Set this parameter to 1 to merge all segments into one segment.The default behavior is to perform the merge as necessary.
+     * $params['max_num_segments']     = (integer) The number of larger segments into which smaller segments are merged.Set this parameter to 1 to merge all segments into one segment.The default behavior is to perform the merge as necessary.
      * $params['only_expunge_deletes'] = (boolean) Specify whether the operation should only expunge deleted documents
      * $params['primary_only']         = (boolean) Specify whether the operation should only perform on primary shards. Defaults to false. (Default = false)
      * $params['wait_for_completion']  = (boolean) Should the request wait until the force merge is completed. (Default = true)
@@ -1449,12 +1447,10 @@ public function updateAliases(array $params = [])
     public function upgrade(array $params = [])
     {
         $index = $this->extractArgument($params, 'index');
-        $body = $this->extractArgument($params, 'body');
 
         $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Indices\Upgrade::class);
         $endpoint->setParams($params);
         $endpoint->setIndex($index);
-        $endpoint->setBody($body);
 
         return $this->performRequest($endpoint);
     }
diff --git a/src/OpenSearch/Namespaces/IngestNamespace.php b/src/OpenSearch/Namespaces/IngestNamespace.php
index b0ef37235..23e184826 100644
--- a/src/OpenSearch/Namespaces/IngestNamespace.php
+++ b/src/OpenSearch/Namespaces/IngestNamespace.php
@@ -21,8 +21,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class IngestNamespace
  *
diff --git a/src/OpenSearch/Namespaces/InsightsNamespace.php b/src/OpenSearch/Namespaces/InsightsNamespace.php
index 8017024ff..7edb4fdcb 100644
--- a/src/OpenSearch/Namespaces/InsightsNamespace.php
+++ b/src/OpenSearch/Namespaces/InsightsNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class InsightsNamespace
  *
diff --git a/src/OpenSearch/Namespaces/IsmNamespace.php b/src/OpenSearch/Namespaces/IsmNamespace.php
index bebc39111..9aca519f3 100644
--- a/src/OpenSearch/Namespaces/IsmNamespace.php
+++ b/src/OpenSearch/Namespaces/IsmNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class IsmNamespace
  *
@@ -124,7 +122,7 @@ public function existsPolicy(array $params = []): bool
         $endpoint->setParams($params);
         $endpoint->setPolicyId($policy_id);
 
-        return BooleanRequestWrapper::performRequest($endpoint, $this->transport);
+        return BooleanRequestWrapper::sendRequest($endpoint, $this->httpTransport);
     }
 
     /**
diff --git a/src/OpenSearch/Namespaces/KnnNamespace.php b/src/OpenSearch/Namespaces/KnnNamespace.php
index 0fb72f78e..d33805db9 100644
--- a/src/OpenSearch/Namespaces/KnnNamespace.php
+++ b/src/OpenSearch/Namespaces/KnnNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class KnnNamespace
  *
diff --git a/src/OpenSearch/Namespaces/ListNamespace.php b/src/OpenSearch/Namespaces/ListNamespace.php
index f6e97043c..de0aac1fb 100644
--- a/src/OpenSearch/Namespaces/ListNamespace.php
+++ b/src/OpenSearch/Namespaces/ListNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class ListNamespace
  *
@@ -48,7 +46,7 @@ public function help(array $params = [])
      * Returns paginated information about indexes including number of primaries and replicas, document counts, disk size.
      *
      * $params['index']                     = (array) Comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
-     * $params['bytes']                     = (enum) The unit used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
+     * $params['bytes']                     = (any) The unit used to display byte values.
      * $params['cluster_manager_timeout']   = (string) Operation timeout for connection to cluster-manager node.
      * $params['expand_wildcards']          = (any) The type of index that wildcard patterns can match.
      * $params['format']                    = (string) A short version of the Accept header, such as `JSON`, `YAML`.
@@ -63,7 +61,7 @@ public function help(array $params = [])
      * $params['s']                         = (array) Comma-separated list of column names or column aliases to sort by.
      * $params['size']                      = (integer) Maximum number of indexes to be displayed in a page.
      * $params['sort']                      = (enum) Defines order in which indexes will be displayed. Accepted values are `asc` and `desc`. If `desc`, most recently created indexes would be displayed first. (Options = asc,desc)
-     * $params['time']                      = (enum) The unit used to display time values. (Options = d,h,m,micros,ms,nanos,s)
+     * $params['time']                      = (any) The unit used to display time values.
      * $params['v']                         = (boolean) Verbose mode. Display column headers. (Default = false)
      * $params['pretty']                    = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                     = (boolean) Whether to return human readable values for statistics. (Default = true)
@@ -89,7 +87,7 @@ public function indices(array $params = [])
      * Returns paginated details of shard allocation on nodes.
      *
      * $params['index']                   = (array) A comma-separated list of data streams, indexes, and aliases used to limit the request. Supports wildcards (`*`). To target all data streams and indexes, omit this parameter or use `*` or `_all`.
-     * $params['bytes']                   = (enum) The unit used to display byte values. (Options = b,g,gb,k,kb,m,mb,p,pb,t,tb)
+     * $params['bytes']                   = (any) The unit used to display byte values.
      * $params['cluster_manager_timeout'] = (string) Operation timeout for connection to cluster-manager node.
      * $params['format']                  = (string) A short version of the Accept header, such as `JSON`, `YAML`.
      * $params['h']                       = (array) Comma-separated list of column names to display.
@@ -100,7 +98,7 @@ public function indices(array $params = [])
      * $params['s']                       = (array) Comma-separated list of column names or column aliases to sort by.
      * $params['size']                    = (integer) Maximum number of shards to be displayed in a page.
      * $params['sort']                    = (enum) Defines order in which shards will be displayed. Accepted values are `asc` and `desc`. If `desc`, most recently created shards would be displayed first. (Options = asc,desc)
-     * $params['time']                    = (enum) The unit in which to display time values. (Options = d,h,m,micros,ms,nanos,s)
+     * $params['time']                    = (any) The unit in which to display time values.
      * $params['v']                       = (boolean) Verbose mode. Display column headers. (Default = false)
      * $params['pretty']                  = (boolean) Whether to pretty format the returned JSON response. (Default = false)
      * $params['human']                   = (boolean) Whether to return human readable values for statistics. (Default = true)
diff --git a/src/OpenSearch/Namespaces/MlNamespace.php b/src/OpenSearch/Namespaces/MlNamespace.php
index 473a754f6..90bbc40d7 100644
--- a/src/OpenSearch/Namespaces/MlNamespace.php
+++ b/src/OpenSearch/Namespaces/MlNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class MlNamespace
  *
@@ -24,6 +22,55 @@
  */
 class MlNamespace extends AbstractNamespace
 {
+    /**
+     * Create a memory.
+     *
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function createMemory(array $params = [])
+    {
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\CreateMemory::class);
+        $endpoint->setParams($params);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Create a message.
+     *
+     * $params['memory_id']   = (string)
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function createMessage(array $params = [])
+    {
+        $memory_id = $this->extractArgument($params, 'memory_id');
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\CreateMessage::class);
+        $endpoint->setParams($params);
+        $endpoint->setMemoryId($memory_id);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
     /**
      * Delete an agent.
      *
@@ -48,6 +95,30 @@ public function deleteAgent(array $params = [])
         return $this->performRequest($endpoint);
     }
 
+    /**
+     * Delete a memory.
+     *
+     * $params['memory_id']   = (string)
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function deleteMemory(array $params = [])
+    {
+        $memory_id = $this->extractArgument($params, 'memory_id');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\DeleteMemory::class);
+        $endpoint->setParams($params);
+        $endpoint->setMemoryId($memory_id);
+
+        return $this->performRequest($endpoint);
+    }
+
     /**
      * Deletes a model.
      *
@@ -120,6 +191,83 @@ public function deleteTask(array $params = [])
         return $this->performRequest($endpoint);
     }
 
+    /**
+     * Get a memory.
+     *
+     * $params['memory_id']   = (string)
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function getMemory(array $params = [])
+    {
+        $memory_id = $this->extractArgument($params, 'memory_id');
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\GetMemory::class);
+        $endpoint->setParams($params);
+        $endpoint->setMemoryId($memory_id);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Get a message.
+     *
+     * $params['memory_id']   = (string)
+     * $params['message_id']  = (string)
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function getMessage(array $params = [])
+    {
+        $memory_id = $this->extractArgument($params, 'memory_id');
+        $message_id = $this->extractArgument($params, 'message_id');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\GetMessage::class);
+        $endpoint->setParams($params);
+        $endpoint->setMemoryId($memory_id);
+        $endpoint->setMessageId($message_id);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Get a message traces.
+     *
+     * $params['message_id']  = (string)
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function getMessageTraces(array $params = [])
+    {
+        $message_id = $this->extractArgument($params, 'message_id');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\GetMessageTraces::class);
+        $endpoint->setParams($params);
+        $endpoint->setMessageId($message_id);
+
+        return $this->performRequest($endpoint);
+    }
+
     /**
      * Retrieves a model group.
      *
@@ -237,6 +385,101 @@ public function registerModelGroup(array $params = [])
         return $this->performRequest($endpoint);
     }
 
+    /**
+     * Searches for standalone connectors.
+     *
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function searchConnectors(array $params = [])
+    {
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\SearchConnectors::class);
+        $endpoint->setParams($params);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Search memory.
+     *
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function searchMemory(array $params = [])
+    {
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\SearchMemory::class);
+        $endpoint->setParams($params);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Search messages.
+     *
+     * $params['memory_id']   = (string)
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function searchMessage(array $params = [])
+    {
+        $memory_id = $this->extractArgument($params, 'memory_id');
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\SearchMessage::class);
+        $endpoint->setParams($params);
+        $endpoint->setMemoryId($memory_id);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Searches for model groups.
+     *
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function searchModelGroup(array $params = [])
+    {
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\SearchModelGroup::class);
+        $endpoint->setParams($params);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
     /**
      * Searches for models.
      *
@@ -260,6 +503,136 @@ public function searchModels(array $params = [])
         return $this->performRequest($endpoint);
     }
 
+    /**
+     * Trains a model synchronously.
+     *
+     * $params['algorithm_name'] = (string)
+     * $params['pretty']         = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']          = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace']    = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']         = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path']    = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function train(array $params = [])
+    {
+        $algorithm_name = $this->extractArgument($params, 'algorithm_name');
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\Train::class);
+        $endpoint->setParams($params);
+        $endpoint->setAlgorithmName($algorithm_name);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Trains a model and predicts against the same training dataset.
+     *
+     * $params['algorithm_name'] = (string)
+     * $params['pretty']         = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']          = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace']    = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']         = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path']    = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function trainPredict(array $params = [])
+    {
+        $algorithm_name = $this->extractArgument($params, 'algorithm_name');
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\TrainPredict::class);
+        $endpoint->setParams($params);
+        $endpoint->setAlgorithmName($algorithm_name);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Updates a standalone connector.
+     *
+     * $params['connector_id'] = (string)
+     * $params['pretty']       = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']        = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace']  = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']       = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path']  = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function updateConnector(array $params = [])
+    {
+        $connector_id = $this->extractArgument($params, 'connector_id');
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\UpdateConnector::class);
+        $endpoint->setParams($params);
+        $endpoint->setConnectorId($connector_id);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Update a memory.
+     *
+     * $params['memory_id']   = (string)
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function updateMemory(array $params = [])
+    {
+        $memory_id = $this->extractArgument($params, 'memory_id');
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\UpdateMemory::class);
+        $endpoint->setParams($params);
+        $endpoint->setMemoryId($memory_id);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
+    /**
+     * Update a message.
+     *
+     * $params['message_id']  = (string)
+     * $params['pretty']      = (boolean) Whether to pretty format the returned JSON response. (Default = false)
+     * $params['human']       = (boolean) Whether to return human readable values for statistics. (Default = true)
+     * $params['error_trace'] = (boolean) Whether to include the stack trace of returned errors. (Default = false)
+     * $params['source']      = (string) The URL-encoded request definition. Useful for libraries that do not accept a request body for non-POST requests.
+     * $params['filter_path'] = (any) Used to reduce the response. This parameter takes a comma-separated list of filters. It supports using wildcards to match any field or part of a field’s name. You can also exclude fields with "-".
+     *
+     * @param array $params Associative array of parameters
+     * @return array
+     */
+    public function updateMessage(array $params = [])
+    {
+        $message_id = $this->extractArgument($params, 'message_id');
+        $body = $this->extractArgument($params, 'body');
+
+        $endpoint = $this->endpointFactory->getEndpoint(\OpenSearch\Endpoints\Ml\UpdateMessage::class);
+        $endpoint->setParams($params);
+        $endpoint->setMessageId($message_id);
+        $endpoint->setBody($body);
+
+        return $this->performRequest($endpoint);
+    }
+
     /**
      * $params['body']             = (string) The body of the request (Required)
      *
diff --git a/src/OpenSearch/Namespaces/NodesNamespace.php b/src/OpenSearch/Namespaces/NodesNamespace.php
index d5029067b..32dfc08e3 100644
--- a/src/OpenSearch/Namespaces/NodesNamespace.php
+++ b/src/OpenSearch/Namespaces/NodesNamespace.php
@@ -21,8 +21,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class NodesNamespace
  *
diff --git a/src/OpenSearch/Namespaces/NotificationsNamespace.php b/src/OpenSearch/Namespaces/NotificationsNamespace.php
index cf4df692d..997e5bac0 100644
--- a/src/OpenSearch/Namespaces/NotificationsNamespace.php
+++ b/src/OpenSearch/Namespaces/NotificationsNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class NotificationsNamespace
  *
diff --git a/src/OpenSearch/Namespaces/ObservabilityNamespace.php b/src/OpenSearch/Namespaces/ObservabilityNamespace.php
index 167efc0ad..3bc1486e7 100644
--- a/src/OpenSearch/Namespaces/ObservabilityNamespace.php
+++ b/src/OpenSearch/Namespaces/ObservabilityNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class ObservabilityNamespace
  *
diff --git a/src/OpenSearch/Namespaces/PplNamespace.php b/src/OpenSearch/Namespaces/PplNamespace.php
index aa08509af..fa2149c18 100644
--- a/src/OpenSearch/Namespaces/PplNamespace.php
+++ b/src/OpenSearch/Namespaces/PplNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class PplNamespace
  *
diff --git a/src/OpenSearch/Namespaces/QueryNamespace.php b/src/OpenSearch/Namespaces/QueryNamespace.php
index 15ebf3f24..a9f3893e9 100644
--- a/src/OpenSearch/Namespaces/QueryNamespace.php
+++ b/src/OpenSearch/Namespaces/QueryNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class QueryNamespace
  *
diff --git a/src/OpenSearch/Namespaces/RemoteStoreNamespace.php b/src/OpenSearch/Namespaces/RemoteStoreNamespace.php
index a910f508a..1884900d1 100644
--- a/src/OpenSearch/Namespaces/RemoteStoreNamespace.php
+++ b/src/OpenSearch/Namespaces/RemoteStoreNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class RemoteStoreNamespace
  *
diff --git a/src/OpenSearch/Namespaces/ReplicationNamespace.php b/src/OpenSearch/Namespaces/ReplicationNamespace.php
index e90c397da..bc9f709ad 100644
--- a/src/OpenSearch/Namespaces/ReplicationNamespace.php
+++ b/src/OpenSearch/Namespaces/ReplicationNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class ReplicationNamespace
  *
diff --git a/src/OpenSearch/Namespaces/RollupsNamespace.php b/src/OpenSearch/Namespaces/RollupsNamespace.php
index 4a5a00d28..57adaea21 100644
--- a/src/OpenSearch/Namespaces/RollupsNamespace.php
+++ b/src/OpenSearch/Namespaces/RollupsNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class RollupsNamespace
  *
diff --git a/src/OpenSearch/Namespaces/SearchPipelineNamespace.php b/src/OpenSearch/Namespaces/SearchPipelineNamespace.php
index c9f294db9..fea10cfb0 100644
--- a/src/OpenSearch/Namespaces/SearchPipelineNamespace.php
+++ b/src/OpenSearch/Namespaces/SearchPipelineNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class SearchPipelineNamespace
  *
diff --git a/src/OpenSearch/Namespaces/SecurityNamespace.php b/src/OpenSearch/Namespaces/SecurityNamespace.php
index 7930ef900..17dd7fefe 100644
--- a/src/OpenSearch/Namespaces/SecurityNamespace.php
+++ b/src/OpenSearch/Namespaces/SecurityNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class SecurityNamespace
  *
diff --git a/src/OpenSearch/Namespaces/SmNamespace.php b/src/OpenSearch/Namespaces/SmNamespace.php
index 950420a03..3837edbe1 100644
--- a/src/OpenSearch/Namespaces/SmNamespace.php
+++ b/src/OpenSearch/Namespaces/SmNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class SmNamespace
  *
diff --git a/src/OpenSearch/Namespaces/SnapshotNamespace.php b/src/OpenSearch/Namespaces/SnapshotNamespace.php
index b93cb40d1..8f00b42c4 100644
--- a/src/OpenSearch/Namespaces/SnapshotNamespace.php
+++ b/src/OpenSearch/Namespaces/SnapshotNamespace.php
@@ -21,8 +21,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class SnapshotNamespace
  *
diff --git a/src/OpenSearch/Namespaces/SqlNamespace.php b/src/OpenSearch/Namespaces/SqlNamespace.php
index 783668c25..5a9fe9cf7 100644
--- a/src/OpenSearch/Namespaces/SqlNamespace.php
+++ b/src/OpenSearch/Namespaces/SqlNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class SqlNamespace
  *
diff --git a/src/OpenSearch/Namespaces/TasksNamespace.php b/src/OpenSearch/Namespaces/TasksNamespace.php
index 9c46d1117..99fdf5373 100644
--- a/src/OpenSearch/Namespaces/TasksNamespace.php
+++ b/src/OpenSearch/Namespaces/TasksNamespace.php
@@ -21,8 +21,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class TasksNamespace
  *
diff --git a/src/OpenSearch/Namespaces/TransformsNamespace.php b/src/OpenSearch/Namespaces/TransformsNamespace.php
index e4599d227..794c48f3a 100644
--- a/src/OpenSearch/Namespaces/TransformsNamespace.php
+++ b/src/OpenSearch/Namespaces/TransformsNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class TransformsNamespace
  *
diff --git a/src/OpenSearch/Namespaces/WlmNamespace.php b/src/OpenSearch/Namespaces/WlmNamespace.php
index 53670a61d..c520e8ea8 100644
--- a/src/OpenSearch/Namespaces/WlmNamespace.php
+++ b/src/OpenSearch/Namespaces/WlmNamespace.php
@@ -15,8 +15,6 @@
 
 namespace OpenSearch\Namespaces;
 
-use OpenSearch\Namespaces\AbstractNamespace;
-
 /**
  * Class WlmNamespace
  *