diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab8da74c..55248104 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -62,7 +62,8 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fixed `/_cat/cluster_manager`, `/_cat/allocation`, `/_cat/shards`, and `/_cat/thread_pool` ([#373](https://github.com/opensearch-project/opensearch-api-specification/pull/373))
 - Fixed optional field in `/_nodes` ([#365](https://github.com/opensearch-project/opensearch-api-specification/pull/365))
 - Fixed `/{index}/_open` can return a `task` ([#376](https://github.com/opensearch-project/opensearch-api-specification/pull/376))
- 
+- Fixed `_source` in `bulk` responses ([#375](https://github.com/opensearch-project/opensearch-api-specification/pull/375))
+
 ### Security
 
 [Unreleased]: https://github.com/opensearch-project/opensearch-api-specification/commits/main/
diff --git a/spec/schemas/_common.yaml b/spec/schemas/_common.yaml
index 713509ee..7ba82ea0 100644
--- a/spec/schemas/_common.yaml
+++ b/spec/schemas/_common.yaml
@@ -671,11 +671,9 @@ components:
           $ref: '#/components/schemas/Routing'
         _source:
           type: object
-          additionalProperties:
-            type: object
+          additionalProperties: true
       required:
         - found
-        - _source
     Names:
       oneOf:
         - $ref: '#/components/schemas/Name'
@@ -1256,7 +1254,6 @@ components:
           type: object
       required:
         - found
-        - _source
     IndexAlias:
       type: string
     ErrorResponseBase:
diff --git a/tests/_core/bulk.yaml b/tests/_core/bulk.yaml
index 04e03e24..e7cc18cb 100644
--- a/tests/_core/bulk.yaml
+++ b/tests/_core/bulk.yaml
@@ -12,18 +12,23 @@ chapters:
     request_body:
       content_type: application/x-ndjson
       payload:
-        - {create: {_index: movies}}
-        - {director: Bennett Miller, title: Moneyball, year: 2011}
+        - { create: { _index: movies } }
+        - { director: Bennett Miller, title: Moneyball, year: 2011 }
   - synopsis: Bulk document CRUD.
     path: /_bulk
     method: POST
     request_body:
       content_type: application/x-ndjson
       payload:
-        - {create: {_index: books, _id: book_1392214}}
-        - {author: Harper Lee, title: To Kill a Mockingbird, year: 1960}
-        - {update: {_index: books, _id: book_1392214}}
-        - {doc: {pages: 376}}
-        - {update: {_index: books, _id: book_1392214}}
-        - {script: {source: 'ctx._source.pages = 376;'}}
-        - {delete: {_index: books, _id: book_1392214}}
+        - { create: { _index: books, _id: book_1392214 } }
+        - { author: Harper Lee, title: To Kill a Mockingbird, year: 1960 }
+        - { update: { _index: books, _id: book_1392214 } }
+        - { doc: { pages: 376 } }
+        - { update: { _index: books, _id: book_1392214 } }
+        - { doc: { pages: 376 }, _source: true }
+        - { update: { _index: books, _id: book_1392214 } }
+        - { script: { source: 'ctx._source.pages = 376;' } }
+        - { update: { _index: books, _id: does_not_exist } }
+        - { script: { source: 'ctx.op = "none";' }, scripted_upsert: true, upsert: { pages: 375 } }
+        - { delete: { _index: books, _id: book_1392214 } }
+