es进行聚合操作时提示Fielddata is disabled on text fields by default

来源：互联网发布：电阻串联和并联的算法编辑：程序博客网时间：2024/05/17 23:54

根据es官网的文档执行

让我们找到所有职员中最大的共同点（兴趣爱好）是什么：

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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