Fix explain data lifecycle api spec (#95855)

Author: gmarouli

rest-api-spec/src/main/resources/rest-api-spec/api/indices.explain_data_lifecycle.json

@@ -31,6 +31,10 @@
  "include_defaults": {
  "type": "boolean",
  "description": "indicates if the API should return the default values the system uses for the index's lifecycle"
+ },
+ "master_timeout": {
+ "type": "time",
+ "description": "Specify timeout for connection to master"
  }
  }
  }