ES 聚合分类（text字段）语句报错

{
  "query": {
    "bool": {
      "must": {
        "term": {
          "type.keyword": "test"
        }
      }
    }
  },
  "from": 0,
  "size": 0,
  "sort": [
    {
      "msg_time": {
        "order": "desc"
      }
    }
  ],
  "aggs": {
    "myName": {
      "terms": {
        "field": "xxxx"
      }
    }
  }
}

　　报错信息如下：

Fielddata is disabled on text fields by default. Set fielddata=true on [title] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead.

       使用ES版本为：5.1.1

　　解决办法：

　　

PUT my-index-000001/_mapping/type
{
  "properties": {
    "my_field": { 
      "type":     "text",
      "fielddata": true
    }