diff --git a/pulsar-io/elastic-search/src/test/java/org/apache/pulsar/io/elasticsearch/ElasticSearchTestBase.java b/pulsar-io/elastic-search/src/test/java/org/apache/pulsar/io/elasticsearch/ElasticSearchTestBase.java
index fca3fc5d056dd..58ebe3caf833c 100644
--- a/pulsar-io/elastic-search/src/test/java/org/apache/pulsar/io/elasticsearch/ElasticSearchTestBase.java
+++ b/pulsar-io/elastic-search/src/test/java/org/apache/pulsar/io/elasticsearch/ElasticSearchTestBase.java
@@ -59,6 +59,7 @@ protected ElasticsearchContainer createElasticsearchContainer() {
         if (elasticImageName.equals(OPENSEARCH)) {
             DockerImageName dockerImageName = DockerImageName.parse(OPENSEARCH).asCompatibleSubstituteFor("docker.elastic.co/elasticsearch/elasticsearch");
             elasticsearchContainer = new ElasticsearchContainer(dockerImageName)
+                    .withEnv("OPENSEARCH_INITIAL_ADMIN_PASSWORD", "0pEn7earch!")
                     .withEnv("OPENSEARCH_JAVA_OPTS", "-Xms128m -Xmx256m")
                     .withEnv("bootstrap.memory_lock", "true")
                     .withEnv("plugins.security.disabled", "true");