diff --git a/.cspell b/.cspell
index eb1d955ba..bf297ec39 100644
--- a/.cspell
+++ b/.cspell
@@ -10,6 +10,7 @@ authc
 authinfo
 authtoken
 autocut
+autofollow
 backendroles
 backpressure
 beider
@@ -74,6 +75,7 @@ ignorecase
 integ
 internalusers
 Intertransport
+ipam
 Jelinek
 kibanainfo
 kibanaserver
@@ -90,6 +92,7 @@ lucene
 Lucene
 lycheeverse
 marvinpinto
+memlock
 metaphone
 mget
 millis
@@ -206,6 +209,7 @@ Translog
 trbl
 truststore
 tubone
+ulimits
 Undeploys
 unigrams
 Unmanaged
diff --git a/.github/workflows/test-spec.yml b/.github/workflows/test-spec.yml
index a6c1e78ec..8bc1abeea 100644
--- a/.github/workflows/test-spec.yml
+++ b/.github/workflows/test-spec.yml
@@ -36,6 +36,9 @@ jobs:
             tests: routing
           - version: 2.18.0
             tests: snapshot
+          - version: 2.18.0
+            tests: plugins/replication
+            url: http://localhost:9200
           - version: 2.18.0
             tests: plugins/streaming
           - version: 2.18.0
@@ -89,6 +92,7 @@ jobs:
             --opensearch-insecure \
             --opensearch-version=${{ matrix.entry.version }} \
             --coverage coverage/test-spec-coverage-${{ steps.tests.outputs.hash }}.json \
+            --opensearch-url=${{ matrix.entry.url || 'https://localhost:9200'}} \
             --tests=tests/${{ matrix.entry.tests || 'default' }}
 
       - name: Get Container Logs
diff --git a/.lycheeignore b/.lycheeignore
index caa2546d0..1b6a61169 100644
--- a/.lycheeignore
+++ b/.lycheeignore
@@ -1,2 +1,3 @@
 https://localhost:*
+http://localhost:*
 http://webhook:8080
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 045729721..5854a451c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -96,6 +96,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added support for request headers in tests [#461](https://github.com/opensearch-project/opensearch-api-specification/pull/461)
 - Added metadata additionalProperties to `ErrorCause` ([#462](https://github.com/opensearch-project/opensearch-api-specification/pull/462))
 - Added `creation_date` field to `DanglingIndex` ([#462](https://github.com/opensearch-project/opensearch-api-specification/pull/462))
+- Added `replication` namespace API specifications ([#464](https://github.com/opensearch-project/opensearch-api-specification/pull/464))
 - Added doc on `cluster create-index blocked` workaround ([#465](https://github.com/opensearch-project/opensearch-api-specification/pull/465))
 - Added `observability` namespace API specifications ([#474](https://github.com/opensearch-project/opensearch-api-specification/pull/474))
 - Added support for reusing output variables as keys in payload expectations ([#471](https://github.com/opensearch-project/opensearch-api-specification/pull/471))
diff --git a/spec/namespaces/replication.yaml b/spec/namespaces/replication.yaml
new file mode 100644
index 000000000..db8e0c7b8
--- /dev/null
+++ b/spec/namespaces/replication.yaml
@@ -0,0 +1,301 @@
+openapi: 3.1.0
+info:
+  title: OpenSearch Replication API
+  description: OpenSearch Replication API.
+  version: 1.0.0
+paths:
+  /_plugins/_replication/{index}/_start:
+    put:
+      operationId: replication.start.0
+      x-operation-group: replication.start
+      x-version-added: '1.1'
+      description: Initiate replication of an index from the leader cluster to the follower cluster.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#start-replication
+      parameters:
+        - $ref: '#/components/parameters/replication.start::path.index'
+      requestBody:
+        $ref: '#/components/requestBodies/replication.start'
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.start@200'
+  /_plugins/_replication/{index}/_stop:
+    post:
+      operationId: replication.stop.0
+      x-operation-group: replication.stop
+      x-version-added: '1.1'
+      description: Terminates replication and converts the follower index to a standard index.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#stop-replication
+      parameters:
+        - $ref: '#/components/parameters/replication.stop::path.index'
+      requestBody:
+        $ref: '#/components/requestBodies/replication.stop'
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.stop@200'
+  /_plugins/_replication/{index}/_pause:
+    post:
+      operationId: replication.pause.0
+      x-operation-group: replication.pause
+      x-version-added: '1.1'
+      description: Pauses replication of the leader index.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#pause-replication
+      parameters:
+        - $ref: '#/components/parameters/replication.pause::path.index'
+      requestBody:
+        $ref: '#/components/requestBodies/replication.pause'
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.pause@200'
+  /_plugins/_replication/{index}/_resume:
+    post:
+      operationId: replication.resume.0
+      x-operation-group: replication.resume
+      x-version-added: '1.1'
+      description: Resumes replication of the leader index.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#resume-replication
+      parameters:
+        - $ref: '#/components/parameters/replication.resume::path.index'
+      requestBody:
+        $ref: '#/components/requestBodies/replication.resume'
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.resume@200'
+  /_plugins/_replication/{index}/_status:
+    get:
+      operationId: replication.status.0
+      x-operation-group: replication.status
+      x-version-added: '1.1'
+      description: Gets the status of index replication.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#get-replication-status
+      parameters:
+        - $ref: '#/components/parameters/replication.status::path.index'
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.status@200'
+  /_plugins/_replication/leader_stats:
+    get:
+      operationId: replication.leader_stats.0
+      x-operation-group: replication.leader_stats
+      x-version-added: '1.1'
+      description: Gets information about replicated leader indexes on a specified cluster.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#get-leader-cluster-stats
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.leader_stats@200'
+  /_plugins/_replication/follower_stats:
+    get:
+      operationId: replication.follower_stats.0
+      x-operation-group: replication.follower_stats
+      x-version-added: '1.1'
+      description: Gets information about follower (syncing) indexes on a specified cluster.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#get-follower-cluster-stats
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.follower_stats@200'
+  /_plugins/_replication/autofollow_stats:
+    get:
+      operationId: replication.autofollow_stats.0
+      x-operation-group: replication.autofollow_stats
+      x-version-added: '1.1'
+      description: Gets information about auto-follow activity and any replication rules configured on the specified cluster.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#get-auto-follow-stats
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.autofollow_stats@200'
+  /_plugins/_replication/{index}/_update:
+    put:
+      operationId: replication.update_settings.0
+      x-operation-group: replication.update_settings
+      x-version-added: '1.1'
+      description: Updates settings on the follower index.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#update-settings
+      parameters:
+        - $ref: '#/components/parameters/replication.update_settings::path.index'
+      requestBody:
+        $ref: '#/components/requestBodies/replication.update_settings'
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.update_settings@200'
+  /_plugins/_replication/_autofollow:
+    post:
+      operationId: replication.create_replication_rule.0
+      x-operation-group: replication.create_replication_rule
+      x-version-added: '1.1'
+      description: Automatically starts replication on indexes matching a specified pattern.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#create-replication-rule
+      requestBody:
+        $ref: '#/components/requestBodies/replication.create_replication_rule'
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.create_replication_rule@200'
+    delete:
+      operationId: replication.delete_replication_rule.0
+      x-operation-group: replication.delete_replication_rule
+      x-version-added: '1.1'
+      description: Deletes the specified replication rule.
+      externalDocs:
+        url: https://opensearch.org/docs/latest/tuning-your-cluster/replication-plugin/api/#delete-replication-rule
+      requestBody:
+        $ref: '#/components/requestBodies/replication.delete_replication_rule'
+      responses:
+        '200':
+          $ref: '#/components/responses/replication.delete_replication_rule@200'
+components:
+  parameters:
+    replication.start::path.index:
+      in: path
+      name: index
+      description: Name of the data stream, index, or index alias to perform bulk actions on.
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/IndexName'
+      style: simple
+    replication.stop::path.index:
+      in: path
+      name: index
+      description: Name of the data stream, index, or index alias to perform bulk actions on.
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/IndexName'
+      style: simple
+    replication.pause::path.index:
+      in: path
+      name: index
+      description: Name of the data stream, index, or index alias to perform bulk actions on.
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/IndexName'
+      style: simple
+    replication.resume::path.index:
+      in: path
+      name: index
+      description: Name of the data stream, index, or index alias to perform bulk actions on.
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/IndexName'
+      style: simple
+    replication.status::path.index:
+      in: path
+      name: index
+      description: Name of the data stream, index, or index alias to perform bulk actions on.
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/IndexName'
+      style: simple
+    replication.update_settings::path.index:
+      in: path
+      name: index
+      description: Name of the data stream, index, or index alias to perform bulk actions on.
+      required: true
+      schema:
+        $ref: '../schemas/_common.yaml#/components/schemas/IndexName'
+      style: simple
+  requestBodies:
+    replication.start:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/replication._common.yaml#/components/schemas/Replication'
+      required: true
+    replication.stop:
+      content:
+        application/json:
+          schema:
+            type: object
+      required: true
+    replication.pause:
+      content:
+        application/json:
+          schema:
+            type: object
+      required: true
+    replication.resume:
+      content:
+        application/json:
+          schema:
+            type: object
+      required: true
+    replication.update_settings:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/replication._common.yaml#/components/schemas/UpdateSettings'
+      required: true
+    replication.create_replication_rule:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/replication._common.yaml#/components/schemas/CreateReplicationRule'
+      required: true
+    replication.delete_replication_rule:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/replication._common.yaml#/components/schemas/DeleteReplicationRule'
+      required: true
+  responses:
+    replication.start@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/AcknowledgedResponseBase'
+    replication.stop@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/AcknowledgedResponseBase'
+    replication.pause@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/AcknowledgedResponseBase'
+    replication.resume@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/AcknowledgedResponseBase'
+    replication.status@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/replication._common.yaml#/components/schemas/Status'
+    replication.leader_stats@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/replication._common.yaml#/components/schemas/LeaderStatus'
+    replication.follower_stats@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/replication._common.yaml#/components/schemas/FollowerStatus'
+    replication.autofollow_stats@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/replication._common.yaml#/components/schemas/AutoFollowStatus'
+    replication.update_settings@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/AcknowledgedResponseBase'
+    replication.create_replication_rule@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/AcknowledgedResponseBase'
+    replication.delete_replication_rule@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/AcknowledgedResponseBase'
\ No newline at end of file
diff --git a/spec/schemas/replication._common.yaml b/spec/schemas/replication._common.yaml
new file mode 100644
index 000000000..e2b965b0e
--- /dev/null
+++ b/spec/schemas/replication._common.yaml
@@ -0,0 +1,230 @@
+openapi: 3.1.0
+info:
+  title: Schemas of replication._common category.
+  description: Schemas of replication._common category.
+  version: 1.0.0
+paths: {}
+components:
+  schemas:
+    Replication:
+      type: object
+      properties:
+        leader_alias:
+          $ref: '_common.yaml#/components/schemas/IndexAlias'
+        leader_index:
+          $ref: '_common.yaml#/components/schemas/IndexName'
+        use_roles:
+          $ref: '#/components/schemas/UseRoles'
+    UseRoles:
+      type: object
+      properties:
+        leader_cluster_role:
+          type: string
+        follower_cluster_role:
+          type: string
+    Status:
+      type: object
+      properties:
+        status:
+          type: string
+          enum:
+            - BOOTSTRAPPING
+            - PAUSED
+            - REPLICATION NOT IN PROGRESS
+            - RUNNING
+            - SYNCING
+        reason:
+          type: string
+        leader_alias:
+          $ref: '_common.yaml#/components/schemas/IndexAlias'
+        leader_index:
+          $ref: '_common.yaml#/components/schemas/IndexName'
+        follower_index:
+          $ref: '_common.yaml#/components/schemas/IndexName'
+        syncing_details:
+          $ref: '#/components/schemas/SyncingDetails'
+    SyncingDetails:
+      type: object
+      properties:
+        leader_checkpoint:
+          type: integer
+        follower_checkpoint:
+          type: integer
+        seq_no:
+          $ref: '_common.yaml#/components/schemas/SequenceNumber'
+    LeaderStatus:
+      type: object
+      properties:
+        num_replicated_indices:
+          type: number
+        operations_read:
+          type: number
+        translog_size_bytes:
+          $ref: '_common.yaml#/components/schemas/ByteCount'
+        operations_read_lucene:
+          type: number
+        operations_read_translog:
+          type: number
+        total_read_time_lucene_millis:
+          $ref: '_common.yaml#/components/schemas/StringifiedEpochTimeUnitMillis'
+        total_read_time_translog_millis:
+          $ref: '_common.yaml#/components/schemas/StringifiedEpochTimeUnitMillis'
+        bytes_read:
+          $ref: '_common.yaml#/components/schemas/ByteCount'
+        index_stats:
+          type: object
+          additionalProperties:
+            $ref: '#/components/schemas/IndexStatus'
+    IndexStatus:
+      type: object
+      properties:
+        operations_read:
+          type: number
+        translog_size_bytes:
+          $ref: '_common.yaml#/components/schemas/ByteCount'
+        operations_read_lucene:
+          type: number
+        operations_read_translog:
+          type: number
+        total_read_time_lucene_millis:
+          $ref: '_common.yaml#/components/schemas/StringifiedEpochTimeUnitMillis'
+        total_read_time_translog_millis:
+          $ref: '_common.yaml#/components/schemas/StringifiedEpochTimeUnitMillis'
+        bytes_read:
+          $ref: '_common.yaml#/components/schemas/ByteCount'
+    FollowerStatus:
+      type: object
+      properties:
+        num_syncing_indices:
+          type: number
+        num_bootstrapping_indices:
+          type: number
+        num_paused_indices:
+          type: number
+        num_failed_indices:
+          type: number
+        num_shard_tasks:
+          type: number
+        num_index_tasks:
+          type: number
+        operations_written:
+          type: number
+        operations_read:
+          type: number
+        failed_read_requests:
+          type: number
+        throttled_read_requests:
+          type: number
+        failed_write_requests:
+          type: number
+        throttled_write_requests:
+          type: number
+        follower_checkpoint:
+          type: number
+        leader_checkpoint:
+          type: number
+        total_write_time_millis:
+          $ref: '_common.yaml#/components/schemas/StringifiedEpochTimeUnitMillis'
+        index_stats:
+          type: object
+          additionalProperties:
+            $ref: '#/components/schemas/IndexFollowerStatus'
+    IndexFollowerStatus:
+      type: object
+      properties:
+        operations_written:
+          type: number
+        operations_read:
+          type: number
+        failed_read_requests:
+          type: number
+        throttled_read_requests:
+          type: number
+        failed_write_requests:
+          type: number
+        throttled_write_requests:
+          type: number
+        follower_checkpoint:
+          type: number
+        leader_checkpoint:
+          type: number
+        total_write_time_millis:
+          $ref: '_common.yaml#/components/schemas/StringifiedEpochTimeUnitMillis'
+    AutoFollowStatus:
+      type: object
+      properties:
+        num_success_start_replication:
+          type: number
+        num_failed_start_replication:
+          type: number
+        num_failed_leader_calls:
+          type: number
+        failed_indices:
+          type: array
+          items:
+            type: string
+        autofollow_stats:
+          type: array
+          items:
+            $ref: '#/components/schemas/AutoFollowStats'
+    AutoFollowStats:
+      type: object
+      properties:
+        name:
+          type: string
+        pattern:
+          type: string
+        num_success_start_replication:
+          type: number
+        num_failed_start_replication:
+          type: number
+        num_failed_leader_calls:
+          type: number
+        failed_indices:
+          type: array
+          items:
+            type: string
+        last_execution_time:
+          type: number
+    SettingsBody:
+      type: object
+      properties:
+        index:
+          $ref: '#/components/schemas/IndexSchema'
+    UpdateSettings:
+      type: object
+      properties:
+        settings:
+          allOf:
+            - type: object
+              properties:
+                index.number_of_shards:
+                  type: integer
+                index.number_of_replicas:
+                  type: integer
+            - $ref: '#/components/schemas/SettingsBody'
+    IndexSchema:
+      type: object
+      properties:
+        number_of_shards:
+          type: integer
+        number_of_replicas:
+          type: integer
+    CreateReplicationRule:
+      type: object
+      properties:
+        leader_alias:
+          $ref: '_common.yaml#/components/schemas/IndexAlias'
+        name:
+          type: string
+        pattern:
+          type: string
+        use_roles:
+          $ref: '#/components/schemas/UseRoles'
+    DeleteReplicationRule:
+      type: object
+      properties:
+        leader_alias:
+          $ref: '_common.yaml#/components/schemas/IndexAlias'
+        name:
+          type: string
\ No newline at end of file
diff --git a/tests/plugins/replication/autofollow.yaml b/tests/plugins/replication/autofollow.yaml
new file mode 100644
index 000000000..89eabce30
--- /dev/null
+++ b/tests/plugins/replication/autofollow.yaml
@@ -0,0 +1,88 @@
+$schema: ../../../json_schemas/test_story.schema.yaml
+
+description: Test replication APIs specs.
+prologues:
+  - path: /{index}
+    method: PUT
+    parameters:
+      index: books
+    request:
+      payload: {}
+  - path: /_bulk
+    method: POST
+    request:
+      content_type: application/x-ndjson
+      payload:
+        - {create: {_index: books, _id: book_1392214}}
+        - {author: Harper Lee, title: To Kill a Mockingbird, year: 1960}
+        - {create: {_index: books, _id: book_1392215}}
+        - {author: Elizabeth Rudnick, title: Beauty and the Beast, year: 1991}
+  - path: /{index}/_refresh
+    method: POST
+    parameters:
+      index: books
+  - path: /_cluster/settings
+    method: PUT
+    request:
+      payload:
+        persistent:
+          cluster:
+            remote:
+              leader-cluster:
+                seeds: ['172.22.0.3:9300']
+  - path: /_plugins/_replication/{index}/_start
+    version: '>= 1.1'
+    method: PUT
+    parameters:
+      index: books-names
+    request:
+      payload:
+        leader_alias: leader-cluster
+        leader_index: books
+        use_roles: 
+          leader_cluster_role: all_access
+          follower_cluster_role: all_access
+epilogues:
+  - path: /_plugins/_replication/{index}/_stop
+    method: POST
+    parameters: 
+      index: books-names
+    request:
+      payload: {}
+  - path: /books-names
+    method: DELETE
+    status: [200, 404]
+  - path: /books
+    method: DELETE
+    status: [200, 404]
+chapters:
+  - synopsis: Create replication rule.
+    path: /_plugins/_replication/_autofollow
+    version: '>= 1.1'
+    method: POST
+    request:
+      payload:
+        leader_alias: leader-cluster
+        name: books
+        pattern: 'books-*'
+        use_roles:
+          leader_cluster_role: leader_role
+          follower_cluster_role: admin
+    response:
+      status: 200
+  - synopsis: Get auto-follow stats.
+    path: /_plugins/_replication/autofollow_stats
+    version: '>= 1.1'
+    method: GET
+    response:
+      status: 200
+  - synopsis: Delete replication rule.
+    path: /_plugins/_replication/_autofollow
+    version: '>= 1.1'
+    method: DELETE
+    request:
+      payload:
+        leader_alias: leader-cluster
+        name: books
+    response:
+      status: 200
\ No newline at end of file
diff --git a/tests/plugins/replication/docker-compose.yml b/tests/plugins/replication/docker-compose.yml
new file mode 100644
index 000000000..041be3f9d
--- /dev/null
+++ b/tests/plugins/replication/docker-compose.yml
@@ -0,0 +1,62 @@
+version: '3'
+
+services:
+  opensearch-leader-node1:
+    image: ${OPENSEARCH_DOCKER_HUB_PROJECT:-opensearchproject}/opensearch:${OPENSEARCH_VERSION:-latest}${OPENSEARCH_DOCKER_REF}
+    environment:
+      - DISABLE_INSTALL_DEMO_CONFIG=true
+      - DISABLE_SECURITY_PLUGIN=true
+      - OPENSEARCH_INITIAL_ADMIN_PASSWORD=${OPENSEARCH_PASSWORD:-myStrongPassword123!}
+      - OPENSEARCH_JAVA_OPTS=-Xms512m -Xmx512m
+      - bootstrap.memory_lock=true
+      - cluster.initial_master_nodes=opensearch-leader-node1
+      - cluster.name=leader-cluster
+      - discovery.seed_hosts=opensearch-leader-node1
+      - network.host=0.0.0.0
+      - node.name=opensearch-leader-node1
+      - path.repo=/tmp/opensearch/repo
+      - plugins.index_state_management.job_interval=1
+    ulimits:
+      memlock:
+        soft: -1
+        hard: -1
+    ports:
+      - '9200:9200'
+      - '9600:9600'
+    networks:
+      opensearch-net:
+        ipv4_address: 172.22.0.3
+
+  opensearch-follower-node1:
+    image: ${OPENSEARCH_DOCKER_HUB_PROJECT:-opensearchproject}/opensearch:${OPENSEARCH_VERSION:-latest}${OPENSEARCH_DOCKER_REF}
+    environment:
+      - DISABLE_INSTALL_DEMO_CONFIG=true
+      - DISABLE_SECURITY_PLUGIN=true
+      - OPENSEARCH_INITIAL_ADMIN_PASSWORD=${OPENSEARCH_PASSWORD:-myStrongPassword123!}
+      - OPENSEARCH_JAVA_OPTS=-Xms512m -Xmx512m
+      - bootstrap.memory_lock=true
+      - cluster.initial_master_nodes=opensearch-follower-node1
+      - cluster.name=follower-cluster
+      - cluster.remote.leader-cluster.seeds=172.22.0.3:9300
+      - discovery.seed_hosts=opensearch-follower-node1
+      - network.host=0.0.0.0
+      - node.name=opensearch-follower-node1
+      - path.repo=/tmp/opensearch/repo
+      - plugins.index_state_management.job_interval=1
+    ulimits:
+      memlock:
+        soft: -1
+        hard: -1
+    ports:
+      - '9201:9200'
+      - '9601:9600'
+    networks:
+      opensearch-net:
+        ipv4_address: 172.22.0.4
+
+networks:
+  opensearch-net:
+    driver: bridge
+    ipam:
+      config:
+        - subnet: 172.22.0.0/24
diff --git a/tests/plugins/replication/index.yaml b/tests/plugins/replication/index.yaml
new file mode 100644
index 000000000..a70a0b991
--- /dev/null
+++ b/tests/plugins/replication/index.yaml
@@ -0,0 +1,74 @@
+$schema: ../../../json_schemas/test_story.schema.yaml
+
+description: Test replication APIs specs.
+prologues:
+  - path: /{index}
+    method: PUT
+    parameters:
+      index: books
+    request:
+      payload: {}
+  - path: /_bulk
+    method: POST
+    request:
+      content_type: application/x-ndjson
+      payload:
+        - {create: {_index: books, _id: book_1392214}}
+        - {author: Harper Lee, title: To Kill a Mockingbird, year: 1960}
+        - {create: {_index: books, _id: book_1392215}}
+        - {author: Elizabeth Rudnick, title: Beauty and the Beast, year: 1991}
+  - path: /{index}/_refresh
+    method: POST
+    parameters:
+      index: books
+  - path: /_cluster/settings
+    method: PUT
+    request:
+      payload:
+        persistent:
+          cluster:
+            remote:
+              leader-cluster:
+                seeds: ['172.22.0.3:9300']
+epilogues:
+  - path: /_plugins/_replication/{index}/_stop
+    method: POST
+    parameters: 
+      index: books-names
+    request:
+      payload: {}
+  - path: /books-names
+    method: DELETE
+    status: [200, 404]
+  - path: /books
+    method: DELETE
+    status: [200, 404]
+chapters:
+  - synopsis: Start replication.
+    path: /_plugins/_replication/{index}/_start
+    version: '>= 1.1'
+    method: PUT
+    parameters:
+      index: books-names
+    request:
+      payload:
+        leader_alias: leader-cluster
+        leader_index: books
+        use_roles: 
+          leader_cluster_role: all_access
+          follower_cluster_role: all_access
+    response:
+      status: 200
+  - synopsis: Update settings.
+    path: /_plugins/_replication/{index}/_update
+    version: '>= 1.1'
+    method: PUT
+    parameters:
+      index: books-names
+    request:
+      payload:
+        settings: 
+          index.number_of_shards: 4
+          index.number_of_replicas: 2
+    response:
+      status: 200
\ No newline at end of file
diff --git a/tests/plugins/replication/stats.yaml b/tests/plugins/replication/stats.yaml
new file mode 100644
index 000000000..6584200ed
--- /dev/null
+++ b/tests/plugins/replication/stats.yaml
@@ -0,0 +1,84 @@
+$schema: ../../../json_schemas/test_story.schema.yaml
+
+description: Test replication APIs specs.
+prologues:
+  - path: /{index}
+    method: PUT
+    parameters:
+      index: books
+    request:
+      payload: {}
+  - path: /_bulk
+    method: POST
+    request:
+      content_type: application/x-ndjson
+      payload:
+        - {create: {_index: books, _id: book_1392214}}
+        - {author: Harper Lee, title: To Kill a Mockingbird, year: 1960}
+        - {create: {_index: books, _id: book_1392215}}
+        - {author: Elizabeth Rudnick, title: Beauty and the Beast, year: 1991}
+  - path: /{index}/_refresh
+    method: POST
+    parameters:
+      index: books
+  - path: /_cluster/settings
+    method: PUT
+    request:
+      payload:
+        persistent:
+          cluster:
+            remote:
+              leader-cluster:
+                seeds: ['172.22.0.3:9300']
+  - path: /_plugins/_replication/{index}/_start
+    version: '>= 1.1'
+    method: PUT
+    parameters:
+      index: books-names
+    request:
+      payload:
+        leader_alias: leader-cluster
+        leader_index: books
+        use_roles: 
+          leader_cluster_role: all_access
+          follower_cluster_role: all_access
+epilogues:
+  - path: /_plugins/_replication/{index}/_stop
+    method: POST
+    parameters: 
+      index: books-names
+    request:
+      payload: {}
+  - path: /books-names
+    method: DELETE
+    status: [200, 404]
+  - path: /books
+    method: DELETE
+    status: [200, 404]
+chapters:
+  - synopsis: Get replication stats.
+    path: /_plugins/_replication/{index}/_status
+    version: '>= 1.1'
+    method: GET
+    parameters:
+      index: books-names
+    response:
+      status: 200
+  - synopsis: Get leader stats.
+    path: /_plugins/_replication/leader_stats
+    version: '>= 1.1'
+    method: GET
+    response:
+      status: 200
+  - synopsis: Get follower stats.
+    path: /_plugins/_replication/follower_stats
+    version: '>= 1.1'
+    method: GET
+    response:
+      status: 200
+  - synopsis: Get auto-follow stats.
+    path: /_plugins/_replication/autofollow_stats
+    version: '>= 1.1'
+    method: GET
+    response:
+      status: 200
\ No newline at end of file