Add templates and ilm_policies to the Deprecation API response. (#3648) (#3651)

* Add new fields in the deprecation API response.

* Generate files

* Add new fields to elasticsearch-openapi.json

(cherry picked from commit 7665cdb)

Co-authored-by: Mary Gouseti <[email protected]>

Author: github-actions[bot]

output/openapi/elasticsearch-openapi.json

@@ -41,5 +41,14 @@ export class Response {
      * Machine learning-related deprecation warnings.
      */
     ml_settings: Deprecation[]
+    /**
+     * Template warnings are sectioned off per template and include deprecations for both component templates and
+     * index templates.
+     */
+    templates: Dictionary<string, Deprecation[]>
+    /**
+     * ILM policy warnings are sectioned off per policy.
+     */
+    ilm_policies: Dictionary<string, Deprecation[]>
   }
 }