[DOCS] Add ES|QL search operation summary (#3208)

(cherry picked from commit 2d220a5)

Author: lcawl

output/openapi/elasticsearch-openapi.json

@@ -151,6 +151,7 @@ eql-sequences,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/e
 eql-missing-events,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/eql-syntax.html#eql-missing-events
 eql-syntax,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/eql-syntax.html
 eql,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/eql.html
+esql,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/esql.html
 esql-query,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/esql-rest.html
 esql-query-params,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/esql-rest.html#esql-rest-params
 esql-returning-localized-results,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/esql-rest.html#esql-locale-param

output/openapi/elasticsearch-serverless-openapi.json

@@ -24,11 +24,13 @@ import { FieldValue } from '@_types/common'
 import { QueryContainer } from '@_types/query_dsl/abstractions'
 
 /**
- * Executes an ES|QL request
+ * Run an ES|QL query.
+ * Get search results for an ES|QL (Elasticsearch query language) query.
  * @rest_spec_name esql.query
  * @availability stack since=8.11.0
  * @availability serverless
  * @doc_id esql-query
+ * @ext_doc_id esql
  */
 export interface Request extends RequestBase {
   query_parameters: {