Update changelog, add periods to descriptions

Signed-off-by: Alex Keeler <[email protected]>

CHANGELOG.md

@@ -131,6 +131,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fixed security spec to add support for 400 and 403s ([#439](https://github.com/opensearch-project/opensearch-api-specification/pull/439))
 - Fixed required parameters in `NodeInfo` and `NodeOperatingSystemInfo` ([#483](https://github.com/opensearch-project/opensearch-api-specification/pull/483))
 - Fixed query DSL `neural` field `query_image` set `contentEncoding` and `model_id` as optional ([#512](https://github.com/opensearch-project/opensearch-api-specification/pull/512))
+- Fixed `knn` query specification ([#538](https://github.com/opensearch-project/opensearch-api-specification/pull/538))
 
 ### Security
 

spec/schemas/_common.yaml

@@ -597,16 +597,18 @@ components:
         vector:
           $ref: '#/components/schemas/QueryVector'
         k:
-          description: The final number of nearest neighbors to return as top hits
+          description: The final number of nearest neighbors to return as top hits.
           type: number
         min_score:
-          description: The minimum similarity score for a neighbor to be considered a hit
+          description: The minimum similarity score for a neighbor to be considered a hit.
           type: number
+          x-version-added: '2.14'
         max_distance:
-          description: The maximum physical distance in vector space for a neighbor to be considered a hit
+          description: The maximum physical distance in vector space for a neighbor to be considered a hit.
           type: number
+          x-version-added: '2.14'
         filter:
-          description: Filters for the kNN search query
+          description: Filters for the kNN search query.
           oneOf:
             - $ref: '_common.query_dsl.yaml#/components/schemas/QueryContainer'
             - type: array