from https://github.com/elastic/kibana/issues/167992

the error `_id must be unset or set to [GvMPW29fWPE5Sr2ZAAABivq9G6A] but was [_id] because [.ds-metrics-logstash.monitoring-default-2023.10.04-000001] is in time_series mode`

No `_id` field is sent as part of the request so the error must be internal to the endpoint functionality.

This is preventing the creation of runtime fields against TSDS data views in kibana.

--

Steps to reproduce via kibana - 
1. Install `Kibana Sample Data Logs (TSDB)` sample data
2. run via dev tools console
```
POST /_scripts/painless/_execute
{
  "script": {
    "source": """
      emit(doc['release_date'].value.year < 1972);
    """
  },
  "context": "boolean_field",
  "context_setup": {
    "index": "kibana_sample_data_logstsdb",
    "document": {
      "name": "Dune",
      "author": "Frank Herbert",
      "release_date": "1965-06-01",
      "page_count": 604,
      "@timestamp" : "2023-09-16T20:06:26.264Z",
      "bytes_counter": 79635479,
      "bytes_gauge": 8823,
      "event": {
        "dataset": "sample_web_logs"
       }
    }
  }
}
```
modules/lang-painless/src/main/java/org/elasticsearch/painless/action/PainlessExecuteAction.java
0,
                            searcher,
                            () -> absoluteStartMillis,
                            null,
                            emptyMap()
                        );
                        return handler.apply(context, indexReader.leaves().get(0));
                    }
                }
            }
        }
    }
    @ServerlessScope(Scope.PUBLIC)
    public static class RestAction extends BaseRestHandler {
        @Override
        public List<Route> routes() {
            return List.of(new Route(GET, "/_scripts/painless/_execute"), new Route(POST, "/_scripts/painless/_execute"));
        }
        @Override
        public String getName() {
            return "_scripts_painless_execute";
        }
        @Override
        protected RestChannelConsumer prepareRequest(RestRequest restRequest, NodeClient client) throws IOException {
            final Request request = Request.parse(restRequest.contentOrSourceParamParser());
            return channel -> client.executeLocally(INSTANCE, request, new RestToXContentListener<>(channel));
        }
    }
}