报错内容：Fielddata is disabled on text fields by default. Set fielddata=true on [xxxxxx] 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.
意思：因为xxxxxx在mapping里是text类型，导致不能聚合，需要将fielddata=true 。但不建议这么做，这玩意太吃内存了。
解决方案：添加一个keyowrd类型来聚合。