diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f5d66069..6c2981618 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added missing `status` to `/_search/template` response ([#702](https://github.com/opensearch-project/opensearch-api-specification/pull/702))
 - Added `_type` to `rank_eval` API specs ([#704](https://github.com/opensearch-project/opensearch-api-specification/pull/704))
 - Added request body to `_search_shards` API specs ([#709](https://github.com/opensearch-project/opensearch-api-specification/pull/709))
+- Added NodeAttributes as additional property in `shard_stores` API specs ([#715](https://github.com/opensearch-project/opensearch-api-specification/pull/715))
 - Added missing `repository` query parameter to `/_cat/snapshots` ([#700](https://github.com/opensearch-project/opensearch-api-specification/pull/700))
 
 ### Removed
diff --git a/spec/namespaces/_core.yaml b/spec/namespaces/_core.yaml
index 3b71f9287..d48733fd5 100644
--- a/spec/namespaces/_core.yaml
+++ b/spec/namespaces/_core.yaml
@@ -2710,7 +2710,7 @@ components:
                 additionalProperties:
                   type: object
               indices_boost:
-                description: Allows increasing the relevance of specific indices in the search.
+                description: Allows increasing the relevance of specific indexes in the search.
                 type: object
                 additionalProperties:
                   type: number
diff --git a/spec/schemas/indices.shard_stores.yaml b/spec/schemas/indices.shard_stores.yaml
index 0745101db..9b76b9027 100644
--- a/spec/schemas/indices.shard_stores.yaml
+++ b/spec/schemas/indices.shard_stores.yaml
@@ -40,6 +40,8 @@ components:
           $ref: '_common.yaml#/components/schemas/Id'
         store_exception:
           $ref: '#/components/schemas/ShardStoreException'
+      additionalProperties:
+        $ref: '_common.yaml#/components/schemas/NodeAttributes'
       required:
         - allocation
     ShardStoreAllocation:
diff --git a/tests/default/_core/shard_stores.yaml b/tests/default/_core/shard_stores.yaml
new file mode 100644
index 000000000..d425f9b73
--- /dev/null
+++ b/tests/default/_core/shard_stores.yaml
@@ -0,0 +1,26 @@
+$schema: ../../../json_schemas/test_story.schema.yaml
+
+description: Test _shard_stores API.
+prologues:
+  - path: /_bulk
+    method: POST
+    parameters:
+      refresh: true
+    request:
+      content_type: application/x-ndjson
+      payload:
+        - {create: {_index: movies, _id: movie1}}
+        - {director: Quentin Tarantino, title: Pulp Fiction, year: 1994}
+        - {create: {_index: movies, _id: movie2}}
+        - {director: Christopher Nolan, title: Inception, year: 2010}
+epilogues:
+  - path: /movies
+    method: DELETE
+    status: [200, 404]
+
+chapters:
+  - synopsis: Verify shard store information across all indices.
+    path: /_shard_stores
+    method: GET
+    response:
+      status: 200
diff --git a/tests/default/indices/shard_stores.yaml b/tests/default/indices/shard_stores.yaml
new file mode 100644
index 000000000..07ca4f8fc
--- /dev/null
+++ b/tests/default/indices/shard_stores.yaml
@@ -0,0 +1,28 @@
+$schema: ../../../json_schemas/test_story.schema.yaml
+
+description: Test _shard_stores API.
+prologues:
+  - path: /_bulk
+    method: POST
+    parameters:
+      refresh: true
+    request:
+      content_type: application/x-ndjson
+      payload:
+        - {create: {_index: movies, _id: movie1}}
+        - {director: Quentin Tarantino, title: Pulp Fiction, year: 1994}
+        - {create: {_index: movies, _id: movie2}}
+        - {director: Christopher Nolan, title: Inception, year: 2010}
+epilogues:
+  - path: /movies
+    method: DELETE
+    status: [200, 404]
+
+chapters:
+  - synopsis: Verify shard store information for a specific index.
+    path: /{index}/_shard_stores
+    parameters:
+      index: movies
+    method: GET
+    response:
+      status: 200
diff --git a/tests/default/notifications/configs.yaml b/tests/default/notifications/configs.yaml
index 3a1523f1e..b89256418 100644
--- a/tests/default/notifications/configs.yaml
+++ b/tests/default/notifications/configs.yaml
@@ -91,7 +91,33 @@ chapters:
       config_id: webhook-configuration
     response:
       status: 200
+  - synopsis: Create another channel configuration.
+    path: /_plugins/_notifications/configs
+    method: POST
+    request:
+      payload:
+        config_id: second-configuration
+        config:
+          name: Notifications Channel
+          description: Second notifications channel.
+          config_type: webhook
+          is_enabled: true
+          webhook:
+            url: http://webhook:8080/
+    response:
+      status: 200
+  - synopsis: Delete multiple channel configurations.
+    version: '>= 2.2'
+    path: /_plugins/_notifications/configs
+    method: DELETE
+    parameters:
+      config_id_list: second-configuration
+    response:
+      status: 200
 epilogues:
   - path: /_plugins/_notifications/configs/webhook-configuration
     method: DELETE
     status: [200,404]
+  - path: /_plugins/_notifications/configs/second-configuration
+    method: DELETE
+    status: [200,404]
diff --git a/tests/plugins/notifications/notifications/feature/test.yaml b/tests/plugins/notifications/notifications/feature/test.yaml
index e889155e1..084aa8b78 100644
--- a/tests/plugins/notifications/notifications/feature/test.yaml
+++ b/tests/plugins/notifications/notifications/feature/test.yaml
@@ -17,7 +17,7 @@ prologues:
             url: http://webhook:8080/
     status: [200]
 chapters:
-  - synopsis: Test sending a notification.
+  - synopsis: Test sending a notification (GET).
     path: /_plugins/_notifications/feature/test/{config_id}
     method: GET
     parameters:
@@ -31,6 +31,20 @@ chapters:
             delivery_status:
               status_code: '200'
               status_text: '{"ok":"true"}'
+  - synopsis: Test sending a notification (POST).
+    path: /_plugins/_notifications/feature/test/{config_id}
+    method: POST
+    parameters:
+      config_id: custom-webhook-configuration
+    response:
+      status: 200
+      payload:
+        status_list:
+          - config_id: custom-webhook-configuration
+            config_type: webhook
+            delivery_status:
+              status_code: '200'
+              status_text: '{"ok":"true"}'
 epilogues:
   - path: /_plugins/_notifications/configs/custom-webhook-configuration
     method: DELETE