ElasticSearch-返回唯一值

Z时代
2024-01-10
分类：问答

我将如何languages从记录中获取所有值，并使它们唯一。

PUT items/1
{ "language" : 10 }
PUT items/2
{ "language" : 11 }
PUT items/3
{ "language" : 10 }

GET items/_search
{ ... }
# => Expected Response
[10, 11]

任何帮助都会很棒。

回答：

您可以使用术语聚合。

{
"size": 0,
"aggs" : {
    "langs" : {
        "terms" : { "field" : "language",  "size" : 500 }
    }
}}

搜索将返回如下内容：

{
"took" : 16,
"timed_out" : false,
"_shards" : {
  "total" : 2,
  "successful" : 2,
  "failed" : 0
},
"hits" : {
"total" : 1000000,
"max_score" : 0.0,
"hits" : [ ]
},
"aggregations" : {
  "langs" : {
    "buckets" : [ {
      "key" : "10",
      "doc_count" : 244812
    }, {
      "key" : "11",
      "doc_count" : 136794
    }, {
      "key" : "12",
      "doc_count" : 32312
       } ]
    }
  }
}