ES|QL: add include_execution_metadata to the query spec (#5328)

Author: luigidellaquila

output/openapi/elasticsearch-openapi.json

@@ -106,10 +106,11 @@ export interface Request extends RequestBase {
      */
     tables?: Dictionary<string, Dictionary<string, TableValuesContainer>>
     /**
-     * When set to `true` and performing a cross-cluster query, the response will include an extra `_clusters`
+     * When set to `true` and performing a cross-cluster/cross-project query, the response will include an extra `_clusters`
      * object with information about the clusters that participated in the search along with info such as shards
      * count.
      * @server_default false
+     * @aliases include_execution_metadata
      */
     include_ccs_metadata?: boolean
     /**

output/openapi/elasticsearch-serverless-openapi.json

@@ -105,10 +105,11 @@ export interface Request extends RequestBase {
      */
     tables?: Dictionary<string, Dictionary<string, TableValuesContainer>>
     /**
-     * When set to `true` and performing a cross-cluster query, the response will include an extra `_clusters`
+     * When set to `true` and performing a cross-cluster/cross-project query, the response will include an extra `_clusters`
      * object with information about the clusters that participated in the search along with info such as shards
      * count.
      * @server_default false
+     * @aliases include_execution_metadata
      */
     include_ccs_metadata?: boolean
   }