elasticsearch reindex。选择嵌套字段

Question

可以为重建索引设置特定的嵌套字段吗？根据docs https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html#docs-reindex-filter-source，所选字段为数组。

    POST _reindex
    {
      "source": {
        "index": "twitter",
        "_source": ["user", "_doc"]
      },
      "dest": {
        "index": "new_twitter"
      }
    }

例如，我们只需要对用户的嵌套字段建立索引，比如"name“和"birthdate"：怎么做呢？我们需要这样的东西：

    POST _reindex
    {
      "source": {
        "index": "twitter",
        "_source": { "user": ["name", "birthdate"], "_doc"]
      },
      "dest": {
        "index": "new_twitter"
      }
    }

Answer 1

POST _reindex 
{
      "source": {
        "index": "twitter",
        "_source": [ "user.name", "user. birthdate", "_doc"]
      },
      "dest": {
        "index": "twitter_new"
      }
    }
}

您需要使用.来引用它们。