我们可以在 ElasticSearch 中的嵌套聚合上应用桶选择器聚合吗？答案

【问题标题】：Can We Apply Bucket Selector Aggregation on Nested Aggregation in ElasticSearch?我们可以在 ElasticSearch 中的嵌套聚合上应用桶选择器聚合吗？
【发布时间】：2018-02-05 17:38:59
【问题描述】：

我想在 ElasticSearch 2.4 中使用管道聚合（桶选择器聚合）到嵌套字段聚合。我想做类似于下面的事情，但我没有成功。如果可以在嵌套字段中进行管道聚合，您能否建议我？

 {
  "size": 0,
  "aggregations": {
    "totalPaidAmount": {
      "nested": {
        "path": "count"
      },
      "aggregations": {
        "paidAmountTotal": {
          "sum": {
            "field": "count.totalPaidAmount"
          }
        },
        "paidAmount_filter": {
          "bucket_selector": {
            "script": {
              "inline": "amount > 5000000"
            },
            "buckets_path": {
              "amount": "paidAmountTotal"
            }
          }
        }
      }
    }
  }
}

【问题讨论】：

标签： elasticsearch lucene

【解决方案1】：

我找到了查询的解决方案。实际上，桶选择器聚合应该与嵌套聚合并行，路径应该由'>'引用，如下所示：

{
  "size": 0,
  "aggregations": {
    "amount": {
      "terms": {
        "field": "countId",
        "size": 0
      },
      "aggregations": {
        "totalPaidAmount": {
          "nested": {
            "path": "count"
          },
          "aggregations": {
            "paidAmountTotal": {
              "sum": {
                "field": "count.totalPaidAmount"
              }
            }
          }
        },
        "paidAmount_filter": {
          "bucket_selector": {
            "script": {
              "inline": "amount > 1000"
            },
            "buckets_path": {
              "amount": "totalPaidAmount>paidAmountTotal"
            }
          }
        }
      }
    }
  }
}

【讨论】：

【解决方案2】：

script 值中缺少 params。所以，paidAmount_filter 应该是这样的：

"bucket_filter": {
  "bucket_selector": {
    "buckets_path": {
      "amount ": "paidAmountTotal"
    },
    "script": "params.amount > 5000000"
  }
}

【讨论】：