ElasticSearch：嵌套桶聚合

Question

我是 ElasticSearch 的新手，所以这个问题对你来说可能很微不足道，但我开始了：

我正在使用kibana_sample_data_ecommerce，哪些文档具有这样的映射

{
    ...
    "order_date" : <datetime>
    "taxful_total_price" : <double>
    ...
}

我想获得数据的基本日常行为：

期待这样的文件：

[
  {
    "qtime" : "00:00",
    "mean" : 20,
    "std" : 40
  },
  {
    "qtime" : "01:00",
    "mean" : 150,
    "std" : 64
  }, 
  ...
]

所以，我认为我需要做的过程是：

Group by day all records -> 
  Group by time window for each day -> 
    Sum all record in each time window -> 
      Cumulative Sum for each sum by time window, thus, I get behavior of a day ->
        Extended_stats by the same time window across all days

可以这样表达：

但是我无法打开这些桶来处理这些统计信息。你能给我一些建议来做那个手术并得到那个结果吗？

这是我当前的查询（kibana 开发人员工具）：

POST kibana_sample_data_ecommerce/_search
{
  "size": 0,
  "query": {
    "bool": {
      "must": [
        {
          "range": {
            "order_date": {
              "gt": "now-1M",
              "lte": "now"
            }
          }
        }
      ]
    }
  },
  "aggs": {
    "day_histo": {
      "date_histogram": {
        "field": "order_date",
        "calendar_interval": "day"
      },
      "aggs": {
        "qmin_histo": {
          "date_histogram": {
            "field": "order_date",
            "calendar_interval": "hour"
          },
          "aggs": {
            "qminute_sum": {
              "sum": {
                "field": "taxful_total_price"
              }
            },
            "cumulative_qminute_sum": {
              "cumulative_sum": {
                "buckets_path": "qminute_sum"
              }
            }
          }
        }
      }
    }
  }
}

Answer 1

以下是获取扩展统计数据的方法：

{
  "size": 0,
  "query": {
    "bool": {
      "must": [
        {
          "range": {
            "order_date": {
              "gt": "now-4M",
              "lte": "now"
            }
          }
        }
      ]
    }
  },
  "aggs": {
    "by_day": {
      "date_histogram": {
        "field": "order_date",
        "calendar_interval": "day"
      },
      "aggs": {
        "by_hour": {
          "date_histogram": {
            "field": "order_date",
            "calendar_interval": "hour"
          },
          "aggs": {
            "by_taxful_total_price": {
              "extended_stats": {
                "field": "taxful_total_price"
              }
            }
          }
        }
      }
    }
  }
}

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