Question

我的数据看起来像是：

{
   "id": 321,
   "name": "Parent 1",
   "childs":[
      {
         "id": 3211,
         "name": "Child 1",
         "data": "Some data"
      },
      {
         "id": 3212,
         "name": "Child 2"
      },
      {
         "id": 3213,
         "name": "Child 3"
      }
   ]
}

现在我想查询所有没有＆＃34;数据的所有孩子的ElasticSearch＆＃34;得到这样的结果：

[
   {
      "id":321,
      "childs":[
         3212,
         3213
      ]
   }
]

我在文档中阅读了有关嵌套对象和父子关系的内容。我认为我需要像父子关系，子女的_id和查询_ids而不是查询来源。

有人可以帮我吗？

谢谢

Answer 1

你肯定需要亲子。这是映射：

POST /my_index
{
  "mappings": {
    "parents": {
      "properties": {
        "name": {
          "type": "string"
        }
      }
    },
    "children": {
      "_parent": {
        "type": "parents"
      },
      "properties": {
        "id": {
          "type": "integer"
        },
        "name": {
          "type": "string"
        },
        "data": {
          "type": "string"
        }
      }
    }
  }
}

示例数据：

POST /my_index/parents/_bulk
{"index":{"_id": 1}}
{"name":"Parent 1"}
{"index":{"_id": 2}}
{"name":"Parent 2"}
{"index":{"_id": 3}}
{"name":"Parent 3"}

POST /my_index/children/_bulk
{"index":{"_id": 1, "parent": 1}}
{"name":"Child 1","data":"Some data"}
{"index":{"_id": 2, "parent": 1}}
{"name":"Child 2"}
{"index":{"_id": 3, "parent": 1}}
{"name":"Child 3"}
{"index":{"_id": 4, "parent": 2}}
{"name":"Child 4","data":"Some data 4"}
{"index":{"_id": 5, "parent": 2}}
{"name":"Child 5","data":"Some data 5"}
{"index":{"_id": 6, "parent": 2}}
{"name":"Child 6"}
{"index":{"_id": 7, "parent": 3}}
{"name":"Child 7","data":"Some data 7"}
{"index":{"_id": 8, "parent": 3}}
{"name":"Child 8","data":"Some data 8"}
{"index":{"_id": 9, "parent": 3}}
{"name":"Child 9","data":"Some data 9"}

查询本身：

GET my_index/children/_search
{
  "size": 0, 
  "query": {
    "filtered": {
      "filter": {
        "missing": {
          "field": "data"
        }
      }
    }
  },
  "aggs": {
    "missing_data": {
      "terms": {
        "field": "_parent"
      },
      "aggs": {
        "top_children": {
          "top_hits": {
            "_source": "_parent"
          }
        }
      }
    }
  }
}

您无法使用您想要的格式，但上述查询将返回父级的ID，并为每位父级返回按父级分组的子级ID。

使用ElasticSearch进行分层/父子映射

1 个答案: