请教一个关于es中文 聚合查询 Fielddata is disabled on text 出现的问题

我有一个 类似group by的需求场景，  是吧一个  中文分词字段   进行去重，然后得到每个 有多少个
使用了AggregationBuilder 工具， 再对不分词字段，挺正常的，可以使用
但是使用在  中文分词字段则会报错，内容如下
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Fielddata is disabled on text 
fields by default. Set fielddata=true on [name] 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."}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query",
"grouped":true,"failed_shards":[{"shard":0,"index":"school","node":"H7VIRoOwS8mws78T-0Ce-Q","reason":{
"type":"illegal_argument_exception","reason":"Fielddata is disabled on text fields by default. Set 
fielddata=true on [name] 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."}}]},"status":400} 
 
 
查询资料发现是因为 分词问题，网上给出的解决办法是2个
1 ，这是region这个排序字段的fileddata为true。 但是这个方法很不推荐，会占用大量内存
2 ，查询时候增加  字段值 .keyword 。如下
AggregationBuilder aggregationBuilder = 
AggregationBuilders.terms("nameAgg").field("name.keyword").size(Integer.MAX_VALUE) //1
     .subAggregation(AggregationBuilders.terms("jobAgg").field("job.keyword").size(Integer.MAX_VALUE) //2
          .subAggregation(AggregationBuilders.avg("ageAgg").field("age")) //3
               .subAggregation(AggregationBuilders.count("totalNum").field("name.keyword"))); //4

searchSourceBuilder.aggregation(aggregationBuilder); 
 
但是我增加了 keyword之后发现，只是不报错了。但是值是空的， 请问怎么解决