elasticsearch - 在Elasticsearch中，如何基于不影响实际查询命中的条件过滤特定内部对象

Question

如何根据特定条件仅过滤内部对象。例如，我将产品存储在es中。基于某些字段，我想查询产品，例如型号和其他条件。但是我只想通过传递的语言值列出查询结果的名称和描述。

架构如下

PUT /product/
{"mappings":{"productTypeA":{"dynamic":"strict","properties":{"id":{"type":"keyword"},"model":{"type":"keyword"},"version":{"type":"keyword"},"launchDate":{"type":"date","format":"yyyyMMdd'T'HHmmss.SSSZ","fields":{"keyword":{"type":"keyword"}}},"names":{"type":"object","properties":{"locale":{"type":"keyword"},"value":{"type":"keyword"}}},"descriptions":{"type":"object","properties":{"locale":{"type":"keyword"},"value":{"type":"keyword"}}}}}}}

我的产品1

POST /product/productTypeA/1
{"id":"1","model":"modelA","version":"1.0","launchDate":"20190924T175212.057+0000","names":[{"locale":"en","value":"product one"},{"locale":"fr","value":"produit un"},{"locale":"de","value":"Produkt eins"}],"descriptions":[{"locale":"en","value":"product one description"},{"locale":"fr","value":"description du produit un"},{"locale":"de","value":"Produkt eins Beschreibung"}]}

我的产品2

POST /product/productTypeA/2
{"id":"2","model":"modelA","version":"1.0","launchDate":"20190924T175212.057+0000","names":[{"locale":"en","value":"product two"},{"locale":"fr","value":"produit deux"},{"locale":"de","value":"Produkt zwei"}],"descriptions":[{"locale":"en","value":"product two description"},{"locale":"fr","value":"description du produit deux"},{"locale":"de","value":"Produkt zwei Beschreibung"}]}

我在以下提到的产品数据上按如下方式尝试了查询的post_filter

GET /product/productTypeA/_search
{"query":{"bool":{"must":[{"term":{"model":"modelA"}}]}},"post_filter":{"bool":{"should":{"term":{"names.locale":"fr"}}}}}

但是我的结果在所有语言中都有名称和描述，正如我期望的那样，每个查询结果仅以法语显示

{"took":1,"timed_out":false,"_shards":{"total":5,"successful":5,"skipped":0,"failed":0},"hits":{"total":2,"max_score":0.2876821,"hits":[{"_index":"product","_type":"productTypeA","_id":"2","_score":0.2876821,"_source":{"id":"2","model":"modelA","version":"1.0","launchDate":"20190924T175212.057+0000","names":[{"locale":"en","value":"product two"},{"locale":"fr","value":"produit deux"},{"locale":"de","value":"Produkt zwei"}],"descriptions":[{"locale":"en","value":"product two description"},{"locale":"fr","value":"description du produit deux"},{"locale":"de","value":"Produkt zwei Beschreibung"}]}},{"_index":"product","_type":"productTypeA","_id":"1","_score":0.2876821,"_source":{"id":"1","model":"modelA","version":"1.0","launchDate":"20190924T175212.057+0000","names":[{"locale":"en","value":"product one"},{"locale":"fr","value":"produit un"},{"locale":"de","value":"Produkt eins"}],"descriptions":[{"locale":"en","value":"product one description"},{"locale":"fr","value":"description du produit un"},{"locale":"de","value":"Produkt eins Beschreibung"}]}}]}}

Answer 1

如果要过滤“描述”，则需要将映射从object更改为nested type。
对象类型存储为平面字段，因此无法对其进行过滤
例如当description是类型时，其下的对象字段将存储为description.locale等。

下面的查询将返回所有具有法语描述的modelA，并且法语描述将出现在inner_hits中

GET /product/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "term": {
            "model": "modelA"
          }
        },
        {
          "nested": {
            "path": "descriptions",
            "query": {
              "match": {
                "descriptions.locale": "fr"
              }
            },
            "inner_hits": {}
          }
        }
      ]
    }
  }
}

编辑1:

GET /product/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "term": {
            "model": "modelA"
          }
        }
      ],
      "should": [
        {
          "nested": {
            "path": "descriptions",
            "query": {
              "match": {
                "descriptions.locale": "fr"
              }
            },
            "inner_hits": {}
          }
        }
      ]
    }
  }
}