diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a5b3a68c..10e6b1d78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,9 +16,10 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added `PhoneAnalyzer` from `analysis-phonenumber` plugin ([#609](https://github.com/opensearch-project/opensearch-api-specification/pull/609))
 - Added `/_list/indices` & `/_list/shards` api specs ([#613](https://github.com/opensearch-project/opensearch-api-specification/pull/613))
 - Added `GET` and `HEAD /{index}/_source/{id}` returning `404` ([#673](https://github.com/opensearch-project/opensearch-api-specification/pull/673))
-- Added `rename_alias_pattern` and `rename_alias_replacment` to `/_snapshot/{repository}/{snapshot}/_restore` body parameters ([#615](https://github.com/opensearch-project/opensearch-api-specification/pull/615))
+- Added `rename_alias_pattern` and `rename_alias_replacement` to `/_snapshot/{repository}/{snapshot}/_restore` body parameters ([#615](https://github.com/opensearch-project/opensearch-api-specification/pull/615))
 - Added `resource_stats` to `TaskInfoBase` ([#692](https://github.com/opensearch-project/opensearch-api-specification/pull/692))
 - Added `s` to `/_ingest/processor/grok` ([#689](https://github.com/opensearch-project/opensearch-api-specification/pull/689))
+- Added `aggregations` to `/nodes/_usage/{metric}` requests and responses ([#615](https://github.com/opensearch-project/opensearch-api-specification/pull/615))
 
 ### Removed
 - Removed unsupported `_common.mapping:SourceField`'s `mode` field and associated `_common.mapping:SourceFieldMode` enum ([#652](https://github.com/opensearch-project/opensearch-api-specification/pull/652))
@@ -41,6 +42,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fixed `value` type in `ExplanationDetail` and added `_type` to `explain@200` ([#685](https://github.com/opensearch-project/opensearch-api-specification/pull/685))
 - Fixed index settings types ([#684](https://github.com/opensearch-project/opensearch-api-specification/pull/684))
 - Fixed `POST` and `DELETE /_dangling/{index_uuid}` returning `202` ([#686](https://github.com/opensearch-project/opensearch-api-specification/pull/686))
+- Fixed response schema for `/_nodes/reload_secure_settings` and `/_nodes/{node_id}/reload_secure_settings` ([#694](https://github.com/opensearch-project/opensearch-api-specification/pull/694))
 - Fixed `/_ingest/pipeline/{id}/_simulate` response `docs/_source` field schema ([#689](https://github.com/opensearch-project/opensearch-api-specification/pull/689))
 
 ### Changed
diff --git a/spec/schemas/nodes._common.yaml b/spec/schemas/nodes._common.yaml
index 8b4e8ba17..31a4317c3 100644
--- a/spec/schemas/nodes._common.yaml
+++ b/spec/schemas/nodes._common.yaml
@@ -187,8 +187,8 @@ components:
         _nodes:
           $ref: '_common.yaml#/components/schemas/NodeStatistics'
     NodeReloadResult:
-      oneOf:
-        - $ref: '#/components/schemas/Stats'
+      anyOf:
+        - $ref: '#/components/schemas/NodeReloadResponse'
         - $ref: '#/components/schemas/NodeReloadError'
     Stats:
       type: object
@@ -1299,15 +1299,20 @@ components:
         replica_rejections:
           description: Number of indexing requests rejected in the replica stage.
           type: number
-    NodeReloadError:
+    NodeReloadResponse:
       type: object
       properties:
         name:
           $ref: '_common.yaml#/components/schemas/Name'
-        reload_exception:
-          $ref: '_common.yaml#/components/schemas/ErrorCause'
       required:
         - name
+    NodeReloadError:
+      allOf:
+        - $ref: '#/components/schemas/NodeReloadResponse'
+        - type: object
+          properties:
+            reload_exception:
+              $ref: '_common.yaml#/components/schemas/ErrorCause'
     SampleType:
       type: string
       description: The type to sample.
diff --git a/spec/schemas/nodes.usage.yaml b/spec/schemas/nodes.usage.yaml
index 2ce22876e..19deeb842 100644
--- a/spec/schemas/nodes.usage.yaml
+++ b/spec/schemas/nodes.usage.yaml
@@ -10,6 +10,7 @@ components:
       type: string
       enum:
         - _all
+        - aggregations
         - rest_actions
     ResponseBase:
       allOf:
@@ -41,7 +42,5 @@ components:
           additionalProperties:
             type: object
       required:
-        - aggregations
-        - rest_actions
         - since
         - timestamp
diff --git a/tests/default/nodes/reload_secure_settings.yaml b/tests/default/nodes/reload_secure_settings.yaml
new file mode 100644
index 000000000..74568bf70
--- /dev/null
+++ b/tests/default/nodes/reload_secure_settings.yaml
@@ -0,0 +1,16 @@
+$schema: ../../../json_schemas/test_story.schema.yaml
+
+description: The nodes reload secure settings endpoint.
+chapters:
+  - synopsis: Reload secure settings for all nodes.
+    path: /_nodes/reload_secure_settings
+    method: POST
+    response:
+      status: 200
+  - synopsis: Reload secure settings for a node.
+    path: /_nodes/{node_id}/reload_secure_settings
+    method: POST
+    parameters:
+      node_id: _all
+    response:
+      status: 200
diff --git a/tests/default/nodes/stats.yaml b/tests/default/nodes/stats.yaml
index a54f284ae..8886d05e6 100644
--- a/tests/default/nodes/stats.yaml
+++ b/tests/default/nodes/stats.yaml
@@ -179,3 +179,14 @@ chapters:
         - search
     response:
       status: 200
+  - synopsis: Get statistics for search (`node_id`).
+    path: /_nodes/{node_id}/stats/{metric}/{index_metric}
+    method: GET
+    parameters:
+      node_id: _all
+      metric:
+        - indices
+      index_metric:
+        - search
+    response:
+      status: 200
diff --git a/tests/default/nodes/usage.yaml b/tests/default/nodes/usage.yaml
new file mode 100644
index 000000000..083bfcbd1
--- /dev/null
+++ b/tests/default/nodes/usage.yaml
@@ -0,0 +1,60 @@
+$schema: ../../../json_schemas/test_story.schema.yaml
+
+description: Test nodes usage.
+chapters:
+  - synopsis: Get usage for all nodes.
+    path: /_nodes/usage
+    method: GET
+    response:
+      status: 200
+  - synopsis: Get usage for all nodes for all metrics.
+    path: /_nodes/usage/{metric}
+    method: GET
+    parameters:
+      metric:
+        - _all
+    response:
+      status: 200
+  - synopsis: Get usage for all nodes for the `rest_actions` metric.
+    path: /_nodes/usage/{metric}
+    method: GET
+    parameters:
+      metric:
+        - rest_actions
+    response:
+      status: 200
+  - synopsis: Get usage for all nodes for the `aggregations` metric.
+    path: /_nodes/usage/{metric}
+    method: GET
+    parameters:
+      metric:
+        - aggregations
+    response:
+      status: 200
+  - synopsis: Get usage for all nodes (`node_id`).
+    path: /_nodes/{node_id}/usage
+    method: GET
+    parameters:
+      node_id: _all
+    response:
+      status: 200
+  - synopsis: Get usage for all nodes for all metrics (`node_id`).
+    path: /_nodes/{node_id}/usage/{metric}
+    method: GET
+    parameters:
+      node_id: _all
+      metric:
+        - _all
+    response:
+      status: 200
+  - synopsis: Get usage for all nodes and all metrics.
+    warnings:
+      multiple-paths-detected: false
+    path: /_nodes/{node_id}/{metric}
+    method: GET
+    parameters:
+      node_id: _all
+      metric:
+        - _all
+    response:
+      status: 200