弹性搜索查询返回空结果

Question

即使存在与查询匹配的结果，以下查询也会返回空结果。

GET abc*/_search
        {
          "query": {
            "bool": {
              "must": [
                {"range": {
                  "timestamp": {
                    "gte": "2018-01-01T00:00:00.000",
                    "lte": "2018-01-02T12:00:00.465"
                  }
                }}
              ]
            }
          }
        }

当我用must_not替换must时，我得到的结果。以下是我的索引数据

{
      "took": 0,
      "timed_out": false,
      "_shards": {
        "total": 6,
        "successful": 6,
        "skipped": 0,
        "failed": 0
      },
      "hits": {
        "total": 1,
        "max_score": 1,
        "hits": [
          {
            "_index": "abc",
            "_type": "log",
            "_id": "abc3423498239048290",
            "_score": 1,
            "_source": {
              "0": {
                "test": 289,
                "testnested": {
                  "testnested1": 0,
                  "testnested2": 0.615,
                     },
                "test1": 46.17,
                "test2": 59.4,            
                "ts": "2018-01-01T00:08:20.396UTC"
              },
              "1":{
                ----------
                ----------
               },
              ........
              "10":{
                ------------------
              },
              "timestamp": "2018-01-01T00:08:20.396UTC",
             }
    -----------
       }

我有什么问题吗？.timestamp字段的类型为＆＃34; date_hour_minute_second_millis＆＃34;。我正在使用Elasticsearch版本5+。我在另一个索引中使用了相同的查询，它在那里工作。