Add array type to fields in Highlight and default in HighlighterTagsSchema

CHANGELOG.md

@@ -320,6 +320,7 @@ 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 array type to `fields` in `Highlight` and `default` in `HighlighterTagsSchema` ([#1003](https://github.com/opensearch-project/opensearch-api-specification/pull/1003))
 
 ### Changed
 

spec/schemas/_core.search.yaml

@@ -809,11 +809,23 @@ components:
             encoder:
               $ref: '#/components/schemas/HighlighterEncoder'
             fields:
-              type: object
-              additionalProperties:
-                $ref: '#/components/schemas/HighlightField'
+              $ref: '#/components/schemas/HighlightFields'
           required:
             - fields
+    HighlightFields:
+      oneOf:
+        - type: object
+          additionalProperties:
+            $ref: '#/components/schemas/HighlightField'
+        - type: array
+          items:
+            type: object
+            additionalProperties:
+              title: key
+              $ref: '#/components/schemas/HighlightField'
+            minProperties: 1
+            maxProperties: 1
+          x-protobuf-excluded: true
     HighlighterEncoder:
       type: string
       enum:
@@ -951,6 +963,7 @@ components:
     HighlighterTagsSchema:
       type: string
       enum:
+        - default
         - styled
     SourceConfig:
       description: Defines how to fetch a source. Fetching can be disabled entirely, or the source can be filtered.