ElasticSearch 的聚合輸出

Question

我正在使用 ElasticSearch 存儲大約 5000 萬條數據。 數據格式如下。

_id:5e444fc1c5e86c84d1044aeb
meter_id:"jhk"
date:2017-06-17T18:39:28.795+00:00
activePower:Object
unit:"kwh"
Active Power L1:"0"
Active Power L2:"0"
Active Power L3:"0"
Total Active Power:"5"
reactivePower:Object
apparentPower:Object
frequency:Object
thd:Object

現在我想取兩個日期之間的一部分數據，並根據單個日期對其進行分組，並將總有功功率字段添加到特定日期組。

預期產出

[
{ date: '04-19', totalActivePower: 5000},
{ date: '05-19', totalActivePower: 6000}
]

Answer 1

您可以使用date_histogram聚合

詢問

{
  "size": 0, 
  "query": {
    "range": {    --> to filter between dates, you can also use filter aggregation
      "date": {
        "gte": "2017-06-16",
        "lte": "2017-06-17"
      }
    }
  },
  "aggs": {
    "perday": {  
      "date_histogram": {   ---> will split documents on per day basis
        "field": "date",
        "interval": "day"
      },
      "aggs": {
        "totalacticepower": { -- sum of field Total Active Power on that day
          "sum": {
            "field": "Total Active Power"
          }
        }
      }
    }
  }
}

結果：

"aggregations" : {
    "perday" : {
      "buckets" : [
        {
          "key_as_string" : "2017-06-17T00:00:00.000Z",
          "key" : 1497657600000,
          "doc_count" : 1,
          "totalacticepower" : {
            "value" : 5.0
          }
        }
      ]
    }
  }