#### 前言
早在elasticsearch6.x版本时，es查询时默认会显示hits total总数，当然聚合场景下是不会的。目前我们项目将es6.8升级到7.6，一些普通查询，总数显示不正常了，最大只显示10000条。

比如查询语句如下：
```json
GET bd_frequent_test/_search
{
  "query": {
    "match_all": {}
  }
}
```
查询结果如下：
```json
{
	"took": 1,
	"timed_out": false,
	"_shards": {
		"total": 20,
		"successful": 20,
		"skipped": 0,
		"failed": 0
	},
	"hits": {
		"total": {
			"value": 10000,
			"relation": "gte"
		},
		"max_score": 1.0,
		"hits": [{
			"_index": "bd_frequent_test",
			"_type": "_doc",
			"_id": "33030011",
			"_score": 1.0,
			"_routing": "506030",
			"_source": {
				"ape_id": "81",
				"appear_num": 1,
				"create_time": "2019-11-18 01:04:39",
				"event_time": "2019-11-18",
				"id": 33030011,
				"last_event_time": "2019-11-18 01:04:39",
				"pid": "506030",
				"storage_date": "2019-11-18"
			}
		}]
	}
}
```
es7版本只显示10000条总数，而实际命中文档数应该是100000000。

#### 解决办法
原因是7做了修改，默认最大只命中10000条，如果要让普通查询显示出全部命中的文档数，需要在查询中设置：
"track_total_hits":true

语句如下：
```json
GET bd_frequent_test/_search
{
  "query": {
    "match_all": {}
  },
  "track_total_hits":true
}
```
显示结果：
```json
{
	"took": 1,
	"timed_out": false,
	"_shards": {
		"total": 20,
		"successful": 20,
		"skipped": 0,
		"failed": 0
	},
	"hits": {
		"total": {
			"value": 100000000,
			"relation": "eq"
		},
		"max_score": 1.0,
		"hits": [{
			"_index": "bd_frequent_test",
			"_type": "_doc",
			"_id": "33030011",
			"_score": 1.0,
			"_routing": "506030",
			"_source": {
				"ape_id": "81",
				"appear_num": 1,
				"create_time": "2019-11-18 01:04:39",
				"event_time": "2019-11-18",
				"id": 33030011,
				"last_event_time": "2019-11-18 01:04:39",
				"pid": "506030",
				"storage_date": "2019-11-18"
			}
		}]
	}
}
```
命中数就会显示出实际查询命中的文档数了。
hits响应体如下：
```json
		"total": {
			"value": 100000000,
			"relation": "eq"
		}
```

ClassInstance

es7.x版本如何获取查询命中的文档总数

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