Update_By_Query未创建任务

Question

运行时：

ubqResponse = ElasticClient.UpdateByQuery(u => u
                                .Type("entity")
                                .Index(IndexName)
                                .Query(q => ubqquery)
                                .WaitForCompletion(false)
                                .Slices(ubqslices)
                                .Script(script => script.Source(ubqscript).Params(ubqparams)));

然后，我尝试获取应该由以下人员创建的任务：

var currentTask = ubqResponse.Task;
var status = ElasticClient.GetTask(currentTask);

无论如何，每次尝试执行任务时，在代码和Kibana中都会出现以下错误：

{
  "error": {
    "root_cause": [
      {
        "type": "resource_not_found_exception",
        "reason": "task [WKeOw_8eShy-Fvk6lFCWWA:6047942] isn't running and hasn't stored its results"
      }
    ],
    "type": "resource_not_found_exception",
    "reason": "task [WKeOw_8eShy-Fvk6lFCWWA:6047942] isn't running and hasn't stored its results"
  },
  "status": 404
}

断点并使用相同的属性重试Update_By_Query时，效果很好。