elasticsearch搜索引擎的常用方法(四)聚合检索aggs

一、常用的聚合检索语句

统计news索引下的所有新闻的发布机构分别有哪些

GET news/_search
{
  "aggs": {
    "publish_org": {
      "terms": {
        "field": "publish_org.keyword",
        "size": 10
      }
    }
  },
  "size": 0
}

注意：

    聚合的字段不能是text类型字段。如果es配置开启了fielddata=true，则聚合text类型不会报错，但是聚合出来的结果是text字段分词后词的聚合结果

结果如下：

{
  "took" : 32,
  "timed_out" : false,
  "_shards" : {
    "total" : 2,
    "successful" : 2,
    "failed" : 0
  },
  "hits" : {
    "total" : 10000,
    "max_score" : null,
    "hits" : [ ]
  },
  "aggregations" : {
    "publish_org" : {
      "doc_count_error_upper_bound" : 1601,
      "sum_other_doc_count" : 173772,
      "buckets" : [
        {
          "key" : "新京报",
          "doc_count" : 97325
        },
        {
          "key" : "华夏时报",
          "doc_count" : 27339
        },
        {
          "key" : "FX168财经网人物频道",
          "doc_count" : 26442
        },
        {
          "key" : "新