elasticsearch - 用Elasticsearch进行子聚合

Question

我的索引包含像这样的文档

{
  "members": [{
    "name": "James",
    "language": "english"
  }],
  "signupdate": "1/1/2016"
}

我想使用子聚合来获取顶级语言及其注册日期直方图

这就是我所拥有的，但是结果子聚合为空[]

{
  "aggs": {
    "members": {
      "nested": { "path": "members" },
      "aggs": {
        "language": {
          "terms": {
            "field": "members.language"
          },
          "aggs": {
            "date": {
              "date_histogram": {
                "field": "signupdate",
                "interval": "month"
              }
            }
          }
        }
      }
    }
  }
}

flex 搜索甚至可以做到吗？

Answer 1

这是正确的聚合查询(提示:您需要使用 reverse_nested 从嵌套上下文中跳回到父级上下文中)

{
  "aggs": {
    "members": {
      "nested": {
        "path": "members"
      },
      "aggs": {
        "language": {
          "terms": {
            "field": "members.language"
          },
          "aggs": {
            "parent": {
              "reverse_nested": {},
              "aggs": {
                "date": {
                  "date_histogram": {
                    "field": "signupdate",
                    "interval": "month"
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}