diff --git a/spec/namespaces/rollups.yaml b/spec/namespaces/rollups.yaml
new file mode 100644
index 000000000..c9ce1071a
--- /dev/null
+++ b/spec/namespaces/rollups.yaml
@@ -0,0 +1,178 @@
+openapi: 3.1.0
+info:
+  title: OpenSearch Index Rollups API
+  description: OpenSearch Index Rollups API
+  version: 1.0.0
+paths:
+  /_plugins/_rollup/jobs/{id}:
+    get:
+      operationId: rollups.get.0
+      x-operation-group: rollups.get
+      x-version-added: 1.0
+      description: Get an index rollup.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/im-plugin/index-rollups/rollup-api/#get-an-index-rollup-job
+      parameters:
+        - $ref: '#/components/parameters/rollups.get::path.id'
+      responses:
+        '200':
+          $ref: '#/components/responses/rollups.get@200'
+    put:
+      operationId: rollups.put.0
+      x-operation-group: rollups.put
+      x-version-added: 1.0
+      description: Create or update index rollup.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/im-plugin/index-rollups/rollup-api/#create-or-update-an-index-rollup-job
+      responses:
+        '200':
+          $ref: '#/components/responses/rollups.put@200'
+      parameters:
+        - $ref: '#/components/parameters/rollups.put::path.id'
+        - $ref: '#/components/parameters/rollups.put::query.if_seq_no'
+        - $ref: '#/components/parameters/rollups.put::query.if_primary_term'
+      requestBody:
+        $ref: '#/components/requestBodies/rollups.put'
+    delete:
+      operationId: rollups.delete.0
+      x-operation-group: rollups.delete
+      x-version-added: 1.0
+      description: Delete index rollup.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/im-plugin/index-rollups/rollup-api/#delete-an-index-rollup-job
+      responses:
+        '200':
+          $ref: '#/components/responses/rollups.delete@200'
+      parameters:
+        - $ref: '#/components/parameters/rollups.delete::path.id'
+  /_plugins/_rollup/jobs/{id}/_start:
+    post:
+      operationId: rollups.start.0
+      x-operation-group: rollups.start
+      x-version-added: 1.0
+      description: Start rollup.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/im-plugin/index-rollups/rollup-api/#start-or-stop-an-index-rollup-job
+      parameters:
+        - $ref: '#/components/parameters/rollups.start::path.id'
+      responses:
+        '200':
+          $ref: '#/components/responses/rollups.start@200'
+  /_plugins/_rollup/jobs/{id}/_stop:
+    post:
+      operationId: rollups.stop.0
+      x-operation-group: rollups.stop
+      x-version-added: 1.0
+      description: Stop rollup.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/im-plugin/index-rollups/rollup-api/#start-or-stop-an-index-rollup-job
+      parameters:
+        - $ref: '#/components/parameters/rollups.stop::path.id'
+      responses:
+        '200':
+          $ref: '#/components/responses/rollups.stop@200'
+  /_plugins/_rollup/jobs/{id}/_explain:
+    get:
+      operationId: rollups.explain.0
+      x-operation-group: rollups.explain
+      x-version-added: 1.0
+      description: Get a rollup's current status.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/im-plugin/index-rollups/rollup-api/#explain-an-index-rollup-job
+      parameters:
+        - $ref: '#/components/parameters/rollups.explain::path.id'
+      responses:
+        '200':
+          $ref: '#/components/responses/rollups.explain@200'
+components:
+  requestBodies:
+    rollups.put:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/rollups._common.yaml#/components/schemas/RollupEntity'
+  responses:
+    rollups.get@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/rollups._common.yaml#/components/schemas/RollupEntity'
+    rollups.put@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/rollups._common.yaml#/components/schemas/RollupEntity'
+    rollups.delete@200:
+      description: ''
+    rollups.start@200:
+      description: ''
+    rollups.stop@200:
+      description: ''
+    rollups.explain@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/rollups._common.yaml#/components/schemas/ExplainEntities'
+  parameters:
+    rollups.get::path.id:
+      name: id
+      in: path
+      description: Rollup to access
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/Id'
+      style: simple
+    rollups.put::path.id:
+      name: id
+      in: path
+      description: Rollup to access
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/Id'
+      style: simple
+    rollups.delete::path.id:
+      name: id
+      in: path
+      description: Rollup to access
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/Id'
+      style: simple
+    rollups.start::path.id:
+      name: id
+      in: path
+      description: Rollup to access
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/Id'
+      style: simple
+    rollups.stop::path.id:
+      name: id
+      in: path
+      description: Rollup to access
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/Id'
+      style: simple
+    rollups.explain::path.id:
+      name: id
+      in: path
+      description: Rollup to access
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/Id'
+      style: simple
+    rollups.put::query.if_seq_no:
+      name: if_seq_no
+      in: query
+      description: Only perform the operation if the document has this sequence number.
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/SequenceNumber'
+      style: form
+    rollups.put::query.if_primary_term:
+      name: if_primary_term
+      in: query
+      description: Only perform the operation if the document has this primary term.
+      schema:
+        type: number
+      style: form
diff --git a/spec/schemas/rollups._common.yaml b/spec/schemas/rollups._common.yaml
new file mode 100644
index 000000000..e847affe4
--- /dev/null
+++ b/spec/schemas/rollups._common.yaml
@@ -0,0 +1,195 @@
+openapi: 3.1.0
+info:
+  title: Schemas of rollup._common category
+  description: Schemas of rollup._common category
+  version: 1.0.0
+paths: {}
+components:
+  schemas:
+    RollupEntity:
+      type: object
+      properties:
+        _id:
+          type: string
+        _seqNo:
+          type: number
+        _primaryTerm:
+          type: number
+        rollup:
+          $ref: '#/components/schemas/Rollup'
+    Rollup:
+      type: object
+      properties:
+        rollup_id:
+          type: string
+        enabled:
+          type: boolean
+        schedule:
+          $ref: '#/components/schemas/Schedule'
+        last_updated_time:
+          type: number
+        enabled_time:
+          type: number
+        description:
+          type: string
+        schema_version:
+          type: number
+        source_index:
+          type: string
+        target_index:
+          type: string
+        metadata_id:
+          type: string
+        page_size:
+          type: number
+        delay:
+          type: number
+        continuous:
+          type: boolean
+        dimensions:
+          type: array
+          items:
+            $ref: '#/components/schemas/DimensionsConfigItem'
+        metrics:
+          type: array
+          items:
+            $ref: '#/components/schemas/MetricsConfigItem'
+        error_notification:
+          type: string
+          description: 'Set up a Mustache message template for error notifications. For example, if an index rollup job fails, the system sends a message to a Slack channel.'
+    ExplainEntities:
+      type: object
+      properties:
+        item:
+          $ref: '#/components/schemas/Explain'
+    Explain:
+      type: object
+      properties:
+        rollup_id:
+          type: string
+        last_updated_time:
+          type: number
+        continuous:
+          $ref: '#/components/schemas/Continuous'
+    DimensionsConfigItem:
+      type: object
+      properties:
+        histogram:
+          $ref: '#/components/schemas/HistogramDimension'
+        date_histogram:
+          $ref: '#/components/schemas/DateHistogramDimension'
+        terms:
+          $ref: '#/components/schemas/TermsDimension'
+      minproperties: 1
+      maxproperties: 1
+    DateHistogramDimension:
+      type: object
+      properties:
+        fixed_interval:
+          type: string
+        calendar_interval:
+          type: string
+        timezone:
+          type: string
+        source_field:
+          type: string
+        target_field:
+          type: string
+    HistogramDimension:
+      type: object
+      properties:
+        source_field:
+          type: string
+        target_field:
+          type: string
+        interval:
+          type: string
+    TermsDimension:
+      type: object
+      properties:
+        source_field:
+          type: string
+        target_field:
+          type: string
+    MetricsConfigItem:
+      type: object
+      properties:
+        source_field:
+          type: string
+        target_field:
+          type: string
+        metrics:
+          type: array
+          items:
+            $ref: '#/components/schemas/MetricsConfigMetrics'
+    MetricsConfigMetrics:
+      type: object
+      properties:
+        avg:
+          type: object
+        sum:
+          type: object
+        max:
+          type: object
+        min:
+          type: object
+        value_count:
+          type: object
+      minproperties: 1
+      maxproperties: 1
+    Cron:
+      type: object
+      properties:
+        expression:
+          type: string
+        timezone:
+          type: string
+    Schedule:
+      type: object
+      properties:
+        interval:
+          $ref: '#/components/schemas/Interval'
+    Interval:
+      type: object
+      properties:
+        start_time:
+          type: number
+        period:
+          type: number
+        unit:
+          type: string
+        cron:
+          oneOf:
+            - type: array
+              items:
+                $ref: '#/components/schemas/Cron'
+            - $ref: '#/components/schemas/Cron'
+        schedule_delay:
+          type: number
+    Continuous:
+      type: object
+      properties:
+        next_window_start_time:
+          type: number
+        next_window_end_time:
+          type: number
+      status:
+        type: string
+      failure_reason:
+        type: string
+      stats:
+        $ref: '#/components/schemas/Stats'
+    Stats:
+      type: object
+      properties:
+        pages_processsed:
+          type: number
+        documents_processed:
+          type: number
+        rollups_indexed:
+          type: number
+        index_time_in_ms:
+          type: number
+        search_time_in_ms:
+          type: number
+