根据es官网的文档执行
GET /megacorp/employee/_search { "aggs": { "all_interests": { "terms": { "field": "interests" } } } }
这个例子时,报错
{ "error": { "root_cause": [ { "type": "illegal_argument_exception","reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [interests] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory." } ],"type": "search_phase_execution_exception","reason": "all shards failed","phase": "query","grouped": true,"failed_shards": [ { "shard": 0,"index": "megacorp","node": "-Md3f007Q3G6HtdnkXoRiA","reason": { "type": "illegal_argument_exception","reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [interests] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory." } } ],"caused_by": { "type": "illegal_argument_exception","reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [interests] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory." } },"status": 400 }
搜了一下应该是5.x后对排序,聚合这些操作用单独的数据结构(fielddata)缓存到内存里了,需要单独开启,官方解释在此fielddata
简单来说就是在聚合前执行如下操作
PUT megacorp/_mapping/employee/ { "properties": { "interests": { "type": "text","fielddata": true } } }
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