四十五、Elasticsearch聚合分析--下钻分析时按最深层metric进行排序

1、需求

先按照颜色分类，在按照品牌分类，然后按照每个品牌下的平均价格降序序排序

2、实现

GET /tvs/sales/_search 
{
  "size": 0,
  "aggs": {
    "group_by_color": {
      "terms": {
        "field": "color"
      },
      "aggs": {
        "group_by_brand": {
          "terms": {
            "field": "brand",
            "order": {
              "avg_price": "desc"
            }
          },
          "aggs": {
            "avg_price" : {
              "avg": {
                "field": "price"
              }
            }
          }
        }
      }
    }
  }
}

结果

{
  "took": 13,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 8,
    "max_score": 0,
    "hits": []
  },
  "aggregations": {
    "group_by_color": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "红色",
          "doc_count": 4,
          "group_by_brand": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [
              {
                "key": "三星",
                "doc_count": 1,
                "avg_price": {
                  "value": 8000
                }
              },
              {
                "key": "长虹",
                "doc_count": 3,
                "avg_price": {
                  "value": 1666.6666666666667
                }
              }
            ]
          }
        },
        {
          "key": "绿色",
          "doc_count": 2,
          "group_by_brand": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [
              {
                "key": "小米",
                "doc_count": 1,
                "avg_price": {
                  "value": 3000
                }
              },
              {
                "key": "TCL",
                "doc_count": 1,
                "avg_price": {
                  "value": 1200
                }
              }
            ]
          }
        },
        {
          "key": "蓝色",
          "doc_count": 2,
          "group_by_brand": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [
              {
                "key": "小米",
                "doc_count": 1,
                "avg_price": {
                  "value": 2500
                }
              },
              {
                "key": "TCL",
                "doc_count": 1,
                "avg_price": {
                  "value": 1500
                }
              }
            ]
          }
        }
      ]
    }
  }
}

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