diff --git a/CHANGELOG.md b/CHANGELOG.md
index 031a8c442..3616e4f93 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,10 +6,22 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Added
 - Added API specs for query groups lifecycle APIs ([#649](https://github.com/opensearch-project/opensearch-api-specification/pull/649))
+- Added Python and Ruby spec validators ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
 
 ### 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))
 
+### Fixed
+- Spec passes OpenAPI 3.1.0 validations ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+- Global parameters no longer contain invalid `default` ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+- Invalid values of `schema: null` are replaced with `schema: false` ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+- Key names containing invalid `@` and `:` are renamed to `.` and `_` respectively on merge ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+- Added missing `required` to `path` parameters ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+- Added missing `schema` parent to response types ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+- Removed invalid `externalDocs` from `flow_framework.create/update::query.use_case` ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+- Fixed incorrect `style` in `indices.get_mapping::query.index` ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+- Removed invalid `required` from `ppl` responses ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
+
 ## [0.1.0] - 2024-10-25
 
 ### Added
@@ -115,7 +127,6 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added API spec for `adjust_pure_negative` for bool queries ([#641](https://github.com/opensearch-project/opensearch-api-specification/pull/641))
 - Added a spec style checker [#620](https://github.com/opensearch-project/opensearch-api-specification/pull/620).
 - Added `remote_store` to node `Stats` ([#643](https://github.com/opensearch-project/opensearch-api-specification/pull/643))
-- Added Python and Ruby spec validators ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
 
 ### Changed
 
diff --git a/spec/_superseded_operations.yaml b/spec/_superseded_operations.yaml
index 80e556067..d36a404b3 100644
--- a/spec/_superseded_operations.yaml
+++ b/spec/_superseded_operations.yaml
@@ -200,13 +200,13 @@ $schema: ./json_schemas/_superseded_operations.schema.yaml
   operations:
     - GET
     - PUT
-/_opendistro/_ism/policies/{policyID}:
-  superseded_by: /_plugins/_ism/policies/{policyID}
-  operations:
-    - GET
-    - HEAD
-    - PUT
-    - DELETE
+# /_opendistro/_ism/policies/{policyID}:
+#   superseded_by: /_plugins/_ism/policies/{policyID}
+#   operations:
+#     - GET
+#     - HEAD
+#     - PUT
+#     - DELETE
 /_opendistro/_ism/remove:
   superseded_by: /_plugins/_ism/remove
   operations:
@@ -239,10 +239,10 @@ $schema: ./json_schemas/_superseded_operations.schema.yaml
   superseded_by: /_plugins/_knn/{nodeId}/stats/
   operations:
     - GET
-/_opendistro/_knn/{nodeId}/stats/{stat}:
-  superseded_by: /_plugins/_knn/{nodeId}/stats/{stat}
-  operations:
-    - GET
+# /_opendistro/_knn/{nodeId}/stats/{stat}:
+#   superseded_by: /_plugins/_knn/{nodeId}/stats/{stat}
+#   operations:
+#     - GET
 /_opendistro/_performanceanalyzer/_agent/{redirectEndpoint}:
   superseded_by: /_plugins/_performanceanalyzer/_agent/{redirectEndpoint}
   operations:
@@ -353,25 +353,25 @@ $schema: ./json_schemas/_superseded_operations.schema.yaml
   operations:
     - GET
     - PUT
-/_opendistro/_rollup/jobs/{rollupID}:
-  superseded_by: /_plugins/_rollup/jobs/{rollupID}
-  operations:
-    - GET
-    - HEAD
-    - PUT
-    - DELETE
-/_opendistro/_rollup/jobs/{rollupID}/_explain:
-  superseded_by: /_plugins/_rollup/jobs/{rollupID}/_explain
-  operations:
-    - GET
-/_opendistro/_rollup/jobs/{rollupID}/_start:
-  superseded_by: /_plugins/_rollup/jobs/{rollupID}/_start
-  operations:
-    - POST
-/_opendistro/_rollup/jobs/{rollupID}/_stop:
-  superseded_by: /_plugins/_rollup/jobs/{rollupID}/_stop
-  operations:
-    - POST
+# /_opendistro/_rollup/jobs/{rollupID}:
+#   superseded_by: /_plugins/_rollup/jobs/{rollupID}
+#   operations:
+#     - GET
+#     - HEAD
+#     - PUT
+#     - DELETE
+# /_opendistro/_rollup/jobs/{rollupID}/_explain:
+#   superseded_by: /_plugins/_rollup/jobs/{rollupID}/_explain
+#   operations:
+#     - GET
+# /_opendistro/_rollup/jobs/{rollupID}/_start:
+#   superseded_by: /_plugins/_rollup/jobs/{rollupID}/_start
+#   operations:
+#     - POST
+# /_opendistro/_rollup/jobs/{rollupID}/_stop:
+#   superseded_by: /_plugins/_rollup/jobs/{rollupID}/_stop
+#   operations:
+#     - POST
 /_opendistro/_security/api/_upgrade_check/:
   superseded_by: /_plugins/_security/api/_upgrade_check/
   operations:
@@ -400,13 +400,13 @@ $schema: ./json_schemas/_superseded_operations.schema.yaml
   operations:
     - GET
     - PATCH
-/_opendistro/_security/api/actiongroups/{name}:
-  superseded_by: /_plugins/_security/api/actiongroups/{name}
-  operations:
-    - GET
-    - PUT
-    - PATCH
-    - DELETE
+# /_opendistro/_security/api/actiongroups/{name}:
+#   superseded_by: /_plugins/_security/api/actiongroups/{name}
+#   operations:
+#     - GET
+#     - PUT
+#     - PATCH
+#     - DELETE
 /_opendistro/_security/api/audit/:
   superseded_by: /_plugins/_security/api/audit/
   operations:
@@ -432,17 +432,17 @@ $schema: ./json_schemas/_superseded_operations.schema.yaml
   operations:
     - GET
     - PATCH
-/_opendistro/_security/api/internalusers/{name}:
-  superseded_by: /_plugins/_security/api/internalusers/{name}
-  operations:
-    - GET
-    - PUT
-    - PATCH
-    - DELETE
-/_opendistro/_security/api/internalusers/{name}/authtoken:
-  superseded_by: /_plugins/_security/api/internalusers/{name}/authtoken
-  operations:
-    - POST
+# /_opendistro/_security/api/internalusers/{name}:
+#   superseded_by: /_plugins/_security/api/internalusers/{name}
+#   operations:
+#     - GET
+#     - PUT
+#     - PATCH
+#     - DELETE
+# /_opendistro/_security/api/internalusers/{name}/authtoken:
+#   superseded_by: /_plugins/_security/api/internalusers/{name}/authtoken
+#   operations:
+#     - POST
 /_opendistro/_security/api/migrate:
   superseded_by: /_plugins/_security/api/migrate
   operations:
@@ -456,25 +456,25 @@ $schema: ./json_schemas/_superseded_operations.schema.yaml
   operations:
     - GET
     - PATCH
-/_opendistro/_security/api/roles/{name}:
-  superseded_by: /_plugins/_security/api/roles/{name}
-  operations:
-    - GET
-    - PUT
-    - PATCH
-    - DELETE
+# /_opendistro/_security/api/roles/{name}:
+#   superseded_by: /_plugins/_security/api/roles/{name}
+#   operations:
+#     - GET
+#     - PUT
+#     - PATCH
+#     - DELETE
 /_opendistro/_security/api/rolesmapping/:
   superseded_by: /_plugins/_security/api/rolesmapping/
   operations:
     - GET
     - PATCH
-/_opendistro/_security/api/rolesmapping/{name}:
-  superseded_by: /_plugins/_security/api/rolesmapping/{name}
-  operations:
-    - GET
-    - PUT
-    - PATCH
-    - DELETE
+# /_opendistro/_security/api/rolesmapping/{name}:
+#   superseded_by: /_plugins/_security/api/rolesmapping/{name}
+#   operations:
+#     - GET
+#     - PUT
+#     - PATCH
+#     - DELETE
 /_opendistro/_security/api/securityconfig:
   superseded_by: /_plugins/_security/api/securityconfig
   operations:
@@ -518,27 +518,27 @@ $schema: ./json_schemas/_superseded_operations.schema.yaml
   operations:
     - GET
     - PATCH
-/_opendistro/_security/api/tenants/{name}:
-  superseded_by: /_plugins/_security/api/tenants/{name}
-  operations:
-    - GET
-    - PUT
-    - PATCH
-    - DELETE
+# /_opendistro/_security/api/tenants/{name}:
+#   superseded_by: /_plugins/_security/api/tenants/{name}
+#   operations:
+#     - GET
+#     - PUT
+#     - PATCH
+#     - DELETE
 /_opendistro/_security/api/user:
   superseded_by: /_plugins/_security/api/user
   operations:
     - GET
-/_opendistro/_security/api/user/{name}:
-  superseded_by: /_plugins/_security/api/user/{name}
-  operations:
-    - GET
-    - PUT
-    - DELETE
-/_opendistro/_security/api/user/{name}/authtoken:
-  superseded_by: /_plugins/_security/api/user/{name}/authtoken
-  operations:
-    - POST
+# /_opendistro/_security/api/user/{name}:
+#   superseded_by: /_plugins/_security/api/user/{name}
+#   operations:
+#     - GET
+#     - PUT
+#     - DELETE
+# /_opendistro/_security/api/user/{name}/authtoken:
+#   superseded_by: /_plugins/_security/api/user/{name}/authtoken
+#   operations:
+#     - POST
 /_opendistro/_security/api/validate:
   superseded_by: /_plugins/_security/api/validate
   operations:
diff --git a/spec/namespaces/ism.yaml b/spec/namespaces/ism.yaml
index 334bc69f7..9e91d84c7 100644
--- a/spec/namespaces/ism.yaml
+++ b/spec/namespaces/ism.yaml
@@ -178,7 +178,7 @@ paths:
         '200':
           $ref: '#/components/responses/ism.explain_policy@200'
     post:
-      operationId: ism.explain_policy.0
+      operationId: ism.explain_policy.1
       x-operation-group: ism.explain_policy
       description: Gets the currently applied policy on indices.
       externalDocs:
@@ -190,7 +190,7 @@ paths:
           $ref: '#/components/responses/ism.explain_policy@200'
   /_plugins/_ism/explain/{index}:
     get:
-      operationId: ism.explain_policy.1
+      operationId: ism.explain_policy.3
       x-operation-group: ism.explain_policy
       description: Gets the currently applied policy on indices.
       externalDocs:
@@ -203,7 +203,7 @@ paths:
         '200':
           $ref: '#/components/responses/ism.explain_policy@200'
     post:
-      operationId: ism.explain_policy.1
+      operationId: ism.explain_policy.4
       x-operation-group: ism.explain_policy
       description: Gets the currently applied policy on indices.
       externalDocs: