diff --git a/CHANGELOG.md b/CHANGELOG.md
index e81b172ef..e170d4005 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -44,6 +44,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added support for skipping tests using semver range ([#410](https://github.com/opensearch-project/opensearch-api-specification/pull/410))
 - Added `cluster_manager_timeout` to `HEAD /{index}` ([#421](https://github.com/opensearch-project/opensearch-api-specification/pull/421))
 - Added missing fields to `/_nodes/stats` ([#415](https://github.com/opensearch-project/opensearch-api-specification/pull/415))
+- Added missing metrics options to `/_nodes/stats` ([#422](https://github.com/opensearch-project/opensearch-api-specification/pull/422))
 
 ### Changed
 
diff --git a/spec/schemas/nodes.stats.yaml b/spec/schemas/nodes.stats.yaml
index 63d877d34..52dd278d0 100644
--- a/spec/schemas/nodes.stats.yaml
+++ b/spec/schemas/nodes.stats.yaml
@@ -10,18 +10,33 @@ components:
       type: string
       enum:
         - _all
+        - adaptive_selection
+        - admission_control
         - breaker
+        - caches
+        - cluster_manager_throttling
         - discovery
+        - file_cache
         - fs
         - http
         - indexing_pressure
         - indices
+        - ingest
         - jvm
         - os
         - process
+        - repositories
+        - resource_usage_stats
+        - script
+        - script_cache
+        - search_backpressure
         - search_pipeline
+        - segment_replication_backpressure
+        - shard_indexing_pressure
+        - task_cancellation
         - thread_pool
         - transport
+        - weighted_routing
     IndexMetric:
       type: string
       enum:
diff --git a/tests/nodes/info.yaml b/tests/nodes/info.yaml
index 608232cb3..362a04803 100644
--- a/tests/nodes/info.yaml
+++ b/tests/nodes/info.yaml
@@ -2,8 +2,15 @@ $schema: ../../json_schemas/test_story.schema.yaml
 
 description: Test nodes endpoints.
 chapters:
-  - synopsis: Nodes with a json response.
+  - synopsis: Get all nodes.
     path: /_nodes
     method: GET
     response:
       status: 200
+  - synopsis: Get nodes.
+    path: /_nodes/{node_id_or_metric}
+    method: GET
+    parameters:
+      node_id_or_metric: indices
+    response:
+      status: 200
diff --git a/tests/nodes/stats.yaml b/tests/nodes/stats.yaml
index aab5dfdc0..212a58c22 100644
--- a/tests/nodes/stats.yaml
+++ b/tests/nodes/stats.yaml
@@ -2,8 +2,155 @@ $schema: ../../json_schemas/test_story.schema.yaml
 
 description: Test nodes stats.
 chapters:
-  - synopsis: Get all nodes stats.
+  - synopsis: Get stats for all nodes.
     path: /_nodes/stats
     method: GET
     response:
       status: 200
+  - synopsis: Get stats for all nodes with parameters.
+    path: /_nodes/stats
+    method: GET
+    parameters:
+      completion_fields: '*'
+      fielddata_fields: '*'
+      fields: '*'
+      groups:
+        - '*'
+      timeout: 10s
+      include_segment_file_sizes: true
+    response:
+      status: 200
+  - synopsis: Get _all node stats (node_id).
+    path: /_nodes/{node_id}/stats
+    method: GET
+    parameters:
+      node_id: _all
+    response:
+      status: 200
+  - synopsis: Get fs metic node stats (metric).
+    path: /_nodes/stats/{metric}
+    method: GET
+    parameters:
+      metric:
+        - fs
+    response:
+      status: 200
+  - synopsis: Get fs metric node stats (node_id_or_metric).
+    path: /_nodes/{node_id_or_metric}
+    method: GET
+    parameters:
+      node_id_or_metric: fs
+    response:
+      status: 200
+  - synopsis: Get jvm and fs metric node stats from data nodes.
+    path: /_nodes/{node_id}/stats/{metric}
+    method: GET
+    parameters:
+      node_id: data:true
+      metric:
+        - fs
+        - jvm
+    response:
+      status: 200
+  - synopsis: Get statistics for the request_cache.
+    path: /_nodes/stats/{metric}/{index_metric}
+    method: GET
+    parameters:
+      metric:
+        - adaptive_selection
+        - breaker
+        - discovery
+        - fs
+        - http
+        - indexing_pressure
+        - indices
+        - ingest
+        - jvm
+        - os
+        - process
+        - script
+        - script_cache
+        - shard_indexing_pressure
+        - thread_pool
+        - transport
+      index_metric:
+        - request_cache
+    response:
+      status: 200
+  - synopsis: Get statistics for the request_cache (2.4).
+    path: /_nodes/stats/{metric}/{index_metric}
+    method: GET
+    version: '>= 2.4'
+    parameters:
+      metric:
+        - indices
+        - search_backpressure
+      index_metric:
+        - request_cache
+    response:
+      status: 200
+  - synopsis: Get statistics for the request_cache (2.6).
+    path: /_nodes/stats/{metric}/{index_metric}
+    method: GET
+    version: '>= 2.6'
+    parameters:
+      metric:
+        - cluster_manager_throttling
+        - indices
+        - weighted_routing
+      index_metric:
+        - request_cache
+    response:
+      status: 200
+  - synopsis: Get statistics for the request_cache (2.7).
+    path: /_nodes/stats/{metric}/{index_metric}
+    method: GET
+    version: '>= 2.7'
+    parameters:
+      metric:
+        - file_cache
+        - indices
+      index_metric:
+        - request_cache
+    response:
+      status: 200
+  - synopsis: Get statistics for the request_cache (2.9).
+    path: /_nodes/stats/{metric}/{index_metric}
+    method: GET
+    version: '>= 2.9'
+    parameters:
+      metric:
+        - indices
+        - search_pipeline
+        - task_cancellation
+      index_metric:
+        - request_cache
+    response:
+      status: 200
+  - synopsis: Get statistics for the request_cache (2.12).
+    path: /_nodes/stats/{metric}/{index_metric}
+    method: GET
+    version: '>= 2.12'
+    parameters:
+      metric:
+        - admission_control
+        - indices
+        - repositories
+        - resource_usage_stats
+        - segment_replication_backpressure
+      index_metric:
+        - request_cache
+    response:
+      status: 200
+  - synopsis: Get statistics for the request_cache (2.14).
+    path: /_nodes/stats/{metric}/{index_metric}
+    method: GET
+    version: '>= 2.14'
+    parameters:
+      metric:
+        - caches
+        - indices
+      index_metric:
+        - request_cache
+    response:
+      status: 200
\ No newline at end of file