Elasticsearch在進行聚合操作時提示Fielddata is disabled on text fields by default

孤竹星發表於2017-07-20
執行下列語句是報錯
GET /megacorp/employee/_search { "aggs": { "all_interests": { "terms": { "field": "interests" } } } }
 報錯

{
  "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
}

搜了一下應該是5.x後對排序,聚合這些操作用單獨的(fielddata)快取到記憶體裡了,需要單獨開啟,官方解釋在此fielddata

簡單來說就是在聚合前執行如下操作

PUT megacorp/_mapping/employee/
{
  "properties": {
    "interests": { 
      "type":     "text",
      "fielddata": true
    }
  }

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