diff --git a/.github/vale/styles/OpenSearch/NumericFormat.yml b/.github/vale/styles/OpenSearch/NumericFormat.yml
new file mode 100644
index 000000000..c32e5d22e
--- /dev/null
+++ b/.github/vale/styles/OpenSearch/NumericFormat.yml
@@ -0,0 +1,14 @@
+extends: existence
+message: "Schema of type 'number' must specify a 'format'."
+link: https://github.com/opensearch-project/documentation-website/blob/main/TERMS.md
+ignorecase: true
+level: warning
+action:
+  name: remove
+tokens:
+  - type: number
+patterns:
+  - pattern: 'type: number'
+    next_line: 
+      - pattern: 'format:'
+        negate: true
diff --git a/.vale.ini b/.vale.ini
index 9141bb025..b14b6f078 100644
--- a/.vale.ini
+++ b/.vale.ini
@@ -25,6 +25,7 @@ OpenSearch.LoginNoun = YES
 OpenSearch.LoginVerb = YES
 OpenSearch.LogoutNoun = YES
 OpenSearch.LogoutVerb = YES
+OpenSearch.NumericFormat = YES
 OpenSearch.OxfordComma = YES
 OpenSearch.PassiveVoice = NO
 OpenSearch.Please = YES
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e42ff3447..19a7068c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -54,6 +54,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added `GET`, `POST /_plugins/_ml/tasks/_search`, `GET /_plugins/_ml/tools`, `tools/{tool_name}` ([#797](https://github.com/opensearch-project/opensearch-api-specification/pull/797))
 - Added `POST /_plugins/_ml/agents/{agent_id}/_execute`, `GET /_plugins/_ml/agents/{agent_id}`, `GET`, `POST /_plugins/_ml/agents/_search` ([#798](https://github.com/opensearch-project/opensearch-api-specification/pull/798))
 - Added a warning for test file names that don't match the API being tested ([#793](https://github.com/opensearch-project/opensearch-api-specification/pull/793))
+- Added a vale rule for numeric types ([#800](https://github.com/opensearch-project/opensearch-api-specification/pull/800))
 - Added `time` field to the `GetStats` schema in `_common.yml` ([#803](https://github.com/opensearch-project/opensearch-api-specification/pull/803))
 - Added version for `POST /_plugins/_ml/_train/{algorithm_name}`, `_predict/{algorithm_name}/{model_id}`, and `_train_predict/{algorithm_name}` ([#763](https://github.com/opensearch-project/opensearch-api-specification/pull/763))
 - Added `POST _plugins/_security/api/internalusers/{username}` response `201` ([#810](https://github.com/opensearch-project/opensearch-api-specification/pull/810))
diff --git a/spec/namespaces/_core.yaml b/spec/namespaces/_core.yaml
index 7e8bcc884..1b463ab0a 100644
--- a/spec/namespaces/_core.yaml
+++ b/spec/namespaces/_core.yaml
@@ -2273,6 +2273,7 @@ components:
                 - $ref: '../schemas/_core.bulk.yaml#/components/schemas/OperationContainer'
                 - $ref: '../schemas/_core.bulk.yaml#/components/schemas/UpdateAction'
                 - type: object
+                - type: number
             description: The operation definition and data (action-data pairs), separated by newlines
       required: true
     bulk_stream: