elasticsearch - elasticsearch：仅从 url 中获取具有某个非空键的元素

Question

我想过滤弹性搜索查询的结果并仅检索那些具有非空字段的结果

例如。给出以下数据

{
  total: 4912,
  max_score: 1,
  hits: [
{
  {
    _index: "gcba",
    _type: "bafici",
    _id: "5a93472b-5db4-4ff9-8c8a-d13158e72d5f-62",
    _score: 1,
    _source: {
      id_film: "23",
      title: "great film",
    }
  },
  {
    _index: "gcba",
    _type: "bafici",
    _id: "2732fbf4-4e55-4794-8e98-e5d5fa6a0419-40",
    _score: 1,
    _source: {
      name: "conference",
      [...]
    }
  }
}

我想发出类似的东西

.../_search?from=1&size=100&q=id_film:'*'

仅获取具有 id_film 值的元素

Answer 1

在进行通配符查询时，ES 只会默认返回具有该特定字段的文档：

% curl -XPUT http://localhost:9200/foo/bar/1 -d '{"id":1,"id_film":23}'
{"ok":true,"_index":"foo","_type":"bar","_id":"1","_version":1}%

% curl -XPUT http://localhost:9200/foo/bar/2 -d '{"id":2,"foo":23}'
{"ok":true,"_index":"foo","_type":"bar","_id":"2","_version":1}%

% curl "http://localhost:9200/foo/_search?q=id_film:*&pretty=true"
{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "foo",
      "_type" : "bar",
      "_id" : "1",
      "_score" : 1.0, "_source" : {"id":1,"id_film":23}
    } ]
  }
}%

Answer 2

您还可以使用存在（或缺失）过滤器。看这里：

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-exists-filter.html

唯一的问题是，它是一个过滤器，而不是一个查询。要使其与搜索方法一起使用，您需要一个 match_all 查询并作为过滤器存在。（或者，使用在其中指定此过滤器的 constant_score 查询）

Answer 3

新的Exists Query的文档有很好的插图。