Elasticsearch 的 buckets（桶）包含 Histogram、Date Histogram、Range、Date Range、Terms、IPv4 Range、Significant Terms 等；

1.Histogram：

SELECT * FROM INDEX-2017-12 GROUP BY (histogram('alias'='log_date.mthAggs', 'interval'='1', 'field'='log_date.mth'))

{
  "from" : 0,
  "size" : 0,
  "aggregations" : {
    "log_date.mthAggs" : {
      "histogram" : {
        "field" : "log_date.mth",
        "interval" : 1
      }
    }
  }
}
 

2.Date Histogram：

SELECT * FROM INDEX-2017-12 GROUP BY (date_histogram('format'='yyyy-MM', 'alias'='@timestampAggs', 'interval'='1M', 'field'='@timestamp'))

{
  "from" : 0,
  "size" : 0,
  "aggregations" : {
    "@timestampAggs" : {
      "date_histogram" : {
        "field" : "@timestamp",
        "interval" : "1M",
        "format" : "yyyy-MM"
      }
    }
  }
}
 

3.Range：

SELECT * FROM INDEX-2017-12 GROUP BY (range(log_date.mth,1,6,7,12))

{
  "from" : 0,
  "size" : 0,
  "aggregations" : {
    "range(log_date.mth,1,6,7,12)" : {
      "range" : {
        "field" : "log_date.mth",
        "ranges" : [ {
          "from" : 1.0,
          "to" : 6.0
        }, {
          "from" : 6.0,
          "to" : 7.0
        }, {
          "from" : 7.0,
          "to" : 12.0
        } ]
      }
    }
  }
}
 

4.Date Range：

SELECT * FROM INDEX-2017-12 GROUP BY (date_range('format'='yyyy-MM-dd', 'alias'='dateRangeAggs', 'field'='@timestamp','2017-01-01','2017-06-01','now-1M','now-1w','now-2d','now'))

{
  "from" : 0,
  "size" : 0,
  "aggregations" : {
    "dateRangeAggs" : {
      "date_range" : {
        "field" : "@timestamp",
        "ranges" : [ {
          "from" : "2017-01-01",
          "to" : "2017-06-01"
        }, {
          "from" : "2017-06-01",
          "to" : "now-1M"
        }, {
          "from" : "now-1M",
          "to" : "now-1w"
        }, {
          "from" : "now-1w",
          "to" : "now-2d"
        }, {
          "from" : "now-2d",
          "to" : "now"
        } ],
        "format" : "yyyy-MM-dd"
      }
    }
  }
}

5.Terms：

SELECT * FROM INDEX-2017-12 GROUP BY (terms('alias'='methodAggs', 'field'='method', 'size'=6))

{
  "from" : 0,
  "size" : 0,
  "aggregations" : {
    "methodAggs" : {
      "terms" : {
        "field" : "method",
        "size" : 6
      }
    }
  }
}

 6.IPv4 Range：

稍後補充...

7.Significant Terms：

暫時沒找到求 Significant Terms 的 SQL 語句，只能用原生 ES 查詢語句獲取了；

ES 原生查詢語句如下：

{
  "size": 0,
  "query": {
    "bool": {
      "must": [
        {
          "query_string": {
            "query": "*",
            "analyze_wildcard": true
          }
        },
        {
          "range": {
            "@timestamp": {
              "gte": 1451297220869,
              "lte": 1514455620869,
              "format": "epoch_millis"
            }
          }
        }
      ],
      "must_not": []
    }
  },
  "_source": {
    "excludes": []
  },
  "aggs": {
    "2": {
      "significant_terms": {
        "field": "log.client.system",
        "size": 4
      }
    }
  }
}