adding _rank to hit, fix property name (#2721) (#2722)

(cherry picked from commit 177dfd3)

Co-authored-by: Laura Trotta <[email protected]>

Author: github-actions[bot]

output/openapi/elasticsearch-openapi.json

@@ -57,6 +57,7 @@ export class Hit<TDocument> {
   _node?: string
   _routing?: string
   _source?: TDocument
+  _rank?: integer
   _seq_no?: SequenceNumber
   _primary_term?: long
   _version?: VersionNumber

output/openapi/elasticsearch-serverless-openapi.json

@@ -33,5 +33,5 @@ export class RrfRank extends RankBase {
   /** How much influence documents in individual result sets per query have over the final ranked result set  */
   rank_constant?: long
   /** Size of the individual result sets per query */
-  window_size?: long
+  rank_window_size?: long
 }