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

港控/mmm° 2022-05-28 23:10 66阅读 0赞

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
        }
      }
    }

[fielddata]: https://www.elastic.co/guide/en/elasticsearch/reference/current/fielddata.html