Elasticsearch由浅入深（七）搜索引擎：_search含义、_multi-index搜索模式、分页搜索以及深分页性能问题、query string search语法以及_all metadata原理

_search含义

_search查询返回结果数据含义分析

GET _search

{
  "took": 1,
  "timed_out": false,
  "_shards": {
    "total": 16,
    "successful": 16,
    "failed": 0
  },
  "hits": {
    "total": 19,
    "max_score": 1,
    "hits": [
      {
        "_index": ".kibana",
        "_type": "config",
        "_id": "5.2.0",
        "_score": 1,
        "_source": {
          "buildNum": 14695
        }
      },
      {
        "_index": "test_index",
        "_type": "test_type",
        "_id": "AWypxxLYFCl_S-ox4wvd",
        "_score": 1,
        "_source": {
          "test_content": "my test"
        }
      },
      {
        "_index": "test_index",
        "_type": "test_type",
        "_id": "8",
        "_score": 1,
        "_source": {
          "test_field": "test client 2"
        }
      },
      {
        "_index": "test_index",
        "_type": "test_doc",
        "_id": "10",
        "_score": 1,
        "_source": {
          "test_field": "test10 routing _id"
        }
      },
      {
        "_index": "test_index",
        "_type": "test_doc",
        "_id": "11",
        "_score": 1,
        "_routing": "12",
        "_source": {
          "test_field": "test routing not _id"
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "2",
        "_score": 1,
        "_source": {
          "name": "jiajieshi yagao",
          "desc": "youxiao fangzhu",
          "price": 25,
          "producer": "jiajieshi producer",
          "tags": [
            "fangzhu"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "4",
        "_score": 1,
        "_source": {
          "name": "special yagao",
          "desc": "special meibai",
          "price": 50,
          "producer": "special yagao producer",
          "tags": [
            "meibai"
          ]
        }
      },
      {
        "_index": "test_index",
        "_type": "test_type",
        "_id": "6",
        "_score": 1,
        "_source": {
          "test_field": "test test"
        }
      },
      {
        "_index": "test_index",
        "_type": "test_type",
        "_id": "4",
        "_score": 1,
        "_source": {
          "test_field": "test4"
        }
      },
      {
        "_index": "test_index",
        "_type": "test_type",
        "_id": "2",
        "_score": 1,
        "_source": {
          "test_field": "replaces test2"
        }
      }
    ]
  }
}

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