diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4a709673..7f2fcbdcb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -52,6 +52,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Prevented merger tool from printing warnings when used by tester tool [#359](https://github.com/opensearch-project/opensearch-api-specification/pull/359)
 - Replaced the deprecated fs.rmdirSync with fs.rmSync [#359](https://github.com/opensearch-project/opensearch-api-specification/pull/359)
 - Tester tool now provides better context for non-2XX responses when --verbose is used [#359](https://github.com/opensearch-project/opensearch-api-specification/pull/359)
+- Set value required in constant_keyword field type [#419](https://github.com/opensearch-project/opensearch-api-specification/pull/419)
 
 ### Deprecated
 
diff --git a/spec/schemas/_common.mapping.yaml b/spec/schemas/_common.mapping.yaml
index 18ef5472f..6c4645abe 100644
--- a/spec/schemas/_common.mapping.yaml
+++ b/spec/schemas/_common.mapping.yaml
@@ -789,13 +789,14 @@ components:
         - type: object
           properties:
             value:
-              type: object
+              type: string
             type:
               type: string
               enum:
                 - constant_keyword
           required:
             - type
+            - value
     FieldAliasProperty:
       allOf:
         - $ref: '#/components/schemas/PropertyBase'
diff --git a/tests/mapping/constant_keyword.yaml b/tests/mapping/constant_keyword.yaml
new file mode 100644
index 000000000..0d209edc5
--- /dev/null
+++ b/tests/mapping/constant_keyword.yaml
@@ -0,0 +1,31 @@
+$schema: ../../json_schemas/test_story.schema.yaml
+
+description: Test constant_keyword field type and retrieving a doc.
+version: '>= 2.14'
+prologues:
+  - path: /movies
+    method: PUT
+    request_body:
+      payload:
+        mappings:
+          properties:
+            genre:
+              type: constant_keyword
+              value: Romantic comedy
+
+epilogues:
+  - path: /movies
+    method: DELETE
+    status: [200, 404]
+chapters:
+  - synopsis: Create a document.
+    path: /{index}/_doc
+    method: POST
+    parameters:
+      index: movies
+    request_body:
+      payload:
+        genre: Romantic comedy
+        year: 1991
+    response:
+      status: 201