9.1对于最后三个pipeline的想法

[FFFro]

先贴下代码

GET kibana_sample_data_flights/_search
{
  "size": 0,
  "aggs": {
    "flights_by_day": {
      "date_histogram": {
        "field": "timestamp",
        "calendar_interval": "day"
      },
      "aggs": {
        "destinations_by_day": {
          "terms": {
            "field": "DestCityName"
          }
        },
        "most_popular_destination_of_the_day": {
          "max_bucket": {
            "buckets_path": "destinations_by_day._count"
          }
        }
      }
    }
  }
}

GET kibana_sample_data_flights/_search
{
  "size": 0,
  "aggs": {
    "flights_by_day": {
      "date_histogram": {
        "field": "timestamp",
        "calendar_interval": "day"
      },
      "aggs": {
        "destinations_by_day": {
          "terms": {
            "field": "DestCityName"
          }
        },
        "most_popular_destination_of_the_day": {
          "max_bucket": {
            "buckets_path": "destinations_by_day._count"
          }
        }
      }
    },
    "day_with_most_flights": {
      "max_bucket": {
        "buckets_path": "flights_by_day._count"
      }
    }
  }
}

GET kibana_sample_data_flights/_search
{
  "size": 0,
  "aggs": {
    "flights_by_day": {
      "date_histogram": {
        "field": "timestamp",
        "calendar_interval": "day"
      },
      "aggs": {
        "destinations_by_day": {
          "terms": {
            "field": "DestCityName"
          }
        },
        "most_popular_destination_of_the_day": {
          "max_bucket": {
            "buckets_path": "destinations_by_day._count"
          }
        }
      }
    },
    "day_with_most_flights": {
      "max_bucket": {
        "buckets_path": "flights_by_day._count"
      }
    },
    "day_with_the_most_popular_destination_over_all_days": {
      "max_bucket": {
        "buckets_path": "flights_by_day>most_popular_destination_of_the_day"
      }
    }
  }
}

感觉他这个题目表达的不是很清楚，我觉得第一个应该是求每一天中DestCityName聚合后的最大值，第二个是求每一天聚合后document最多的一天，第三个应该是对第一个每天聚合出来的求一个最大值