Elasticsearch Mapping Custom Propery with Script

Question

{
  "mappings": {
    "exam": {
        "properties": {
            "id": {
                "type": "long"
            },
            "score": {
                "type": "integer"
            },
            "custom_score": {
                "type": "integer"
            }
        }
    }
  }
}

i have tihs mapping. The custom_score is calculcated with this script

if(score >= 0)
    custom_score = score
else
    custom_score = score-100

Is it possible elasticsearch auto index this field? I want to use this value to make some sortings to some queries. Thanks

Andrei Stefan · Accepted Answer · 2016-09-05 12:43:11Z

1

You can use a transform but be careful that this feature is deprecated in 2.x and will be removed in ES 5. The only options remaining for ES 5 is to do the transformation in your own client code and index the value already changed accordingly.

But, for now, using transforms:

{
  "mappings": {
    "exam": {
      "transform": {
        "script": "if (ctx._source['score'].toInteger()>=0) ctx._source['custom_score'] = ctx._source['score'].toInteger(); else ctx._source['custom_score'] = ctx._source['score'].toInteger()-100"
      },
      "properties": {
        "id": {
          "type": "long"
        },
        "score": {
          "type": "integer"
        },
        "custom_score": {
          "type": "integer"
        }
      }
    }
  }
}

answered Sep 5, 2016 at 12:43

Andrei Stefan

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