Fix indices.delete_alias response (#2951)

* Fix indices.delete_api response

* specific ack response for indices delete alias

---------

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

Author: pquentin

output/openapi/elasticsearch-openapi.json

@@ -21,5 +21,9 @@ import { AcknowledgedResponseBase } from '@_types/Base'
 
 export class Response {
   /** @codegen_name result */
-  body: AcknowledgedResponseBase
+  body: IndicesAliasesResponseBody
+}
+
+export class IndicesAliasesResponseBody extends AcknowledgedResponseBase {
+  errors?: boolean
 }