ElasticSearch 分组查询

curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
{
  "size": 0,
  "aggs": {
    "group_by_state": {
      "terms": {
        "field": "state"
      }
    }
  }
}'
查询结果

类似SQL中的  SELECT state, COUNT(*) FROM bank GROUP BY state ORDER BY COUNT(*) DESC

参考：https://www.elastic.co/guide/en/elasticsearch/reference/1.7/_executing_aggregations.html#_executing_aggregations