Elasticsearch 响应以代码方式包含项目

Question

我需要删除我在响应中获得的一些额外数据，但需要有条件地删除这些数据，因此简单的包含或排除可能不起作用

GET /houseId/_search
{
    "_source": {
        "include": ["name","labels"]
    },
    "query": {
        "bool": {
            "must": [
                {
                    "terms": {
                        "cloud_id.keyword": [
                            "something"
                        ]
                    }
                }
            ]
        }
    }
}

上面的查询返回以下响应

{
  ...
  "hits" : {
    ...
    "hits" : [
    {
        ...
        "_source" : {
          "name" : "peter",
          "labels" : [
            {
              "value" : "true",
              "key" : "active"
            },
            {
              "value" : "103",
              "key" : "pool-id"
            }
          ]
        }
      },

      {
        ...
        "_source" : {
          "name" : "john",
          "labels" : [
            {
              "value" : "true",
              "key" : "active"
            },
            {
              "value" : "205",
              "key" : "pool-id""
            }
          ]
        }
      }
    ]
  }
}

返回的文档是正确的，但是，我需要删除我在labels字段中获得的一些额外数据。 我只想要键为pool-id的键和值。 这样labels可能如下所示

"labels" : {
              "value" : "205",
              "key" : "pool-id""
           }

Answer 1

要仅返回labels object 中具有"key": "pool-id"的文档，您需要定义显式映射，并且 map labels为嵌套类型。

然后使用带有嵌套查询的 inner_hits 仅返回匹配的nested object。

索引映射：

{
    "mappings": {
        "properties": {
            "labels": {
                "type": "nested"
            }
        }
    }
}

搜索查询：

{
    "_source": {
        "include": [
            "name",
            "labels"
        ]
    },
    "query": {
        "bool": {
            "must": [
                {
                    "terms": {
                        "cloud_id.keyword": [
                            "something"
                        ]
                    }
                },
                {
                    "nested": {
                        "path": "labels",
                        "query": {
                            "term": {
                                "labels.key.keyword": "pool-id"
                            }
                        },
                        "inner_hits": {}
                    }
                }
            ]
        }
    }
}

搜索结果：

 "hits": [
            {
                "_index": "72821655",
                "_id": "1",
                "_score": 0.6931471,
                "_source": {
                    "name": "peter",
                    "labels": [
                        {
                            "value": "true",
                            "key": "active"
                        },
                        {
                            "value": "103",
                            "key": "pool-id"
                        }
                    ]
                },
                "inner_hits": {
                    "labels": {
                        "hits": {
                            "total": {
                                "value": 1,
                                "relation": "eq"
                            },
                            "max_score": 0.6931471,
                            "hits": [
                                {
                                    "_index": "72821655",
                                    "_id": "1",
                                    "_nested": {
                                        "field": "labels",
                                        "offset": 1
                                    },
                                    "_score": 0.6931471,
                                    "_source": {
                                        "value": "103",
                                        "key": "pool-id"
                                    }
                                }
                            ]
                        }
                    }
                }
            },
            {
                "_index": "72821655",
                "_id": "2",
                "_score": 0.6931471,
                "_source": {
                    "name": "john",
                    "labels": [
                        {
                            "value": "true",
                            "key": "active"
                        },
                        {
                            "value": "205",
                            "key": "pool-id"           // note this
                        }
                    ]
                },
                "inner_hits": {
                    "labels": {
                        "hits": {
                            "total": {
                                "value": 1,
                                "relation": "eq"
                            },
                            "max_score": 0.6931471,
                            "hits": [
                                {
                                    "_index": "72821655",
                                    "_id": "2",
                                    "_nested": {
                                        "field": "labels",
                                        "offset": 1
                                    },
                                    "_score": 0.6931471,
                                    "_source": {
                                        "value": "205",
                                        "key": "pool-id"          // note this
                                    }
                                }
                            ]
                        }
                    }
                }
            }
        ]