无法在弹性搜索中设置父子关系

Question

我需要根据用户对象的类型过滤activities属性的子对象。

我的用户对象模型

  {
    userId,
    fistName,
    lastName,
    activities: [
        {mode: 'Typ1', name: 'Some Name', "description": "Some Desc"},
        {mode: 'Typ2', name: 'Some Name2', "description": "Some Desc2"},
        {mode: 'Typ1', name: 'Some Name3', "description": "Some Desc3"}
    ]
}

查询弹性6.7时，我使用父子关系获取整个用户模型，但根据activities中的特定值过滤了mode

为此，我创建了

PUT <my_index>/user/_mappings
{     
            "properties": {                 
                "activities": { 
                      "type": "join",
                      "relations": {
                        "activities": "activities.mode" 
                      }
                    }
            }
}

在查询...

GET <my_index>/user/_search
{
  "size": 1000,
  "query" : {
      "bool": {
        "must": [
            {
              "term": {
                "userId": "123456"
              }
            }
        ],
        "filter": {
          "has_parent": {
            "parent_type": "activities", 
            "query": {
              "term": {
                "activities.mode": "Typ1"
              } 
            }
          } 
        }
      }
    },
  "_source": ["userId",  "firstName", "lastName", "activities.mode", "activities.name"]
}

但是，在尝试上述查询后，我得到的是类似的东西...

{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 0,
    "max_score" : null,
    "hits" : [ ]
  }
}

这里的任何帮助将不胜感激