diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb39f8eaf..d9f1efeb5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -80,6 +80,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added detailed test coverage report ([#513](https://github.com/opensearch-project/opensearch-api-specification/pull/513))
 - Added 404 responses to `/_alias/{name}` and `/{index}/_alias/{name}` ([#519](https://github.com/opensearch-project/opensearch-api-specification/pull/519))
 - Added `asynchronous_search` ([#525](https://github.com/opensearch-project/opensearch-api-specification/pull/525))
+- Added `DELETE /_plugins/_ml/tasks/{task_id}` ([#530](https://github.com/opensearch-project/opensearch-api-specification/pull/530))
 
 ### Changed
 
@@ -93,6 +94,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Lock testing for next release of OpenSearch to a specific SHA ([#431](https://github.com/opensearch-project/opensearch-api-specification/pull/431))
 - Replace nullable with null type ([#436](https://github.com/opensearch-project/opensearch-api-specification/pull/436))
 - Split test suite ([#472])(https://github.com/opensearch-project/opensearch-api-specification/pull/472)
+- Changed `WriteResponseBase`'s `_primary_term`, `_seq_no` & `_version` to have `int64` format ([#530](https://github.com/opensearch-project/opensearch-api-specification/pull/530))
 
 ### Deprecated
 
diff --git a/spec/namespaces/ml.yaml b/spec/namespaces/ml.yaml
index 00054b4cb..17ee03088 100644
--- a/spec/namespaces/ml.yaml
+++ b/spec/namespaces/ml.yaml
@@ -83,6 +83,15 @@ paths:
       responses:
         '200':
           $ref: '#/components/responses/ml.get_task@200'
+    delete:
+      operationId: ml.delete_task.0
+      x-operation-group: ml.delete_task
+      description: Deletes a task.
+      parameters:
+        - $ref: '#/components/parameters/ml.delete_task::path.task_id'
+      responses:
+        '200':
+          $ref: '#/components/responses/ml.delete_task@200'
   /_plugins/_ml/models/_search:
     get:
       operationId: ml.search_models.0
@@ -206,6 +215,11 @@ components:
         application/json:
           schema:
             $ref: '../schemas/_common.yaml#/components/schemas/WriteResponseBase'
+    ml.delete_task@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/WriteResponseBase'
     ml.get_task@200:
       content:
         application/json:
@@ -247,6 +261,12 @@ components:
       required: true
       schema:
         type: string
+    ml.delete_task::path.task_id:
+      name: task_id
+      in: path
+      required: true
+      schema:
+        type: string
     ml.get_task::path.task_id:
       name: task_id
       in: path
diff --git a/spec/schemas/_common.yaml b/spec/schemas/_common.yaml
index f89bdb9bd..903c97c04 100644
--- a/spec/schemas/_common.yaml
+++ b/spec/schemas/_common.yaml
@@ -174,8 +174,10 @@ components:
       type: string
     SequenceNumber:
       type: number
+      format: int64
     VersionNumber:
       type: number
+      format: int64
     SortResults:
       type: array
       items:
@@ -1318,6 +1320,7 @@ components:
           $ref: '#/components/schemas/IndexName'
         _primary_term:
           type: number
+          format: int64
         result:
           $ref: '#/components/schemas/Result'
         _seq_no:
diff --git a/spec/schemas/ml._common.yaml b/spec/schemas/ml._common.yaml
index 400a92fd3..219002dbe 100644
--- a/spec/schemas/ml._common.yaml
+++ b/spec/schemas/ml._common.yaml
@@ -146,12 +146,13 @@ components:
     UndeployModelResponse:
       type: object
       additionalProperties:
-        $ref: '#/components/schemas/UndeployModelResponseModels'
-    UndeployModelResponseModels:
+        title: nodes
+        $ref: '#/components/schemas/UndeployModelNode'
+    UndeployModelNode:
       type: object
       properties:
         stats:
-          $ref: '#/components/schemas/UndeployModelResponseStats'
-    UndeployModelResponseStats:
+          $ref: '#/components/schemas/UndeployModelNodeStats'
+    UndeployModelNodeStats:
       type: object
       additionalProperties: true