如何读取分面搜索查询的JSON输出？

Question

我有属于一个类型的电影，有多个评级。使用ElasticSearch，我想首先对流派进行分面搜索，然后是收视率。

我在这里看到了这个想法：http://www.elasticsearch.org/guide/reference/api/search/facets/

但是我很困惑如何理解这个Curl查询的输出：

curl -X POST "http://localhost:9200/movies/_search?pretty=true" -d '
 {
    "query" : { "query_string" : {"query" : "T*"} },
    "facets" : {
      "categories" : { "terms" : {"field" : "categories"} }
    }
  }
'
{
  "took" : 35,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 3,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "movies",
      "_type" : "movie",
      "_id" : "13",
      "_score" : 1.0, "_source" : {"category_id":2,"created_at":"2013-05-03T16:40:21Z","description":null,"title":"Tiny Plastic Men","updated_at":"2013-05-03T16:40:21Z","user_id":null}
    }, {
      "_index" : "movies",
      "_type" : "movie",
      "_id" : "32",
      "_score" : 1.0, "_source" : {"category_id":14,"created_at":"2013-05-03T16:55:02Z","description":null,"title":"The Extreme Truth","updated_at":"2013-05-03T16:55:02Z","user_id":null}
    }, {
      "_index" : "movies",
      "_type" : "movie",
      "_id" : "39",
      "_score" : 1.0, "_source" : {"category_id":7,"created_at":"2013-05-03T16:55:02Z","description":null,"title":"A Time of Day","updated_at":"2013-05-03T16:55:02Z","user_id":null}
    } ]
  },
  "facets" : {
    "categories" : {
      "_type" : "terms",
      "missing" : 3,
      "total" : 0,
      "other" : 0,
      "terms" : [ ]
    }
  }

我有一些电影以'T'开头，但另外我会期待电影的类型/类别‘惊悚片’。

Answer 1

您的方面似乎与文档中应该使用的任何字段都不匹配：

curl -X POST "http://localhost:9200/movies/_search?pretty=true" -d '
 {
    "query" : { "query_string" : {"query" : "T*"} },
    "facets" : {
      "categories" : { "terms" : {"field" : "category_id"} }
    }
  }
'

那么您将获得category_id的列表和每个category_id中的文档计数