【ElasticSearch】指令碼欄位script

https://www.elastic.co/guide/en/elasticsearch/reference/7.14/modules-scripting.html

可以使用script返回 一個計算值作為屬性值，或者 為query計算一個自定義的分數

【例子】

插入資料

PUT my-index-000001/_doc/1
{
  "my_field": 5
}

查詢結果

GET my-index-000001/_search

{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "my-index-000001",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "my_field" : 5
        }
      }
    ]
  }
}
 

使用script

GET my-index-000001/_search
{
  "script_fields": {
    "my_doubled_field": {
      "script": {
        "source": "doc['my_field'].value * params['multiplier']",
        "params":{
          "multiplier": 2
        }
      }
    }
  }
}

返回結果

{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "my-index-000001",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "fields" : {
          "my_doubled_field" : [
            10
          ]
        }
      }
    ]
  }
}