Invalid values ​​returned by Elasticearch script_field for array.values

I tried to extract array values ​​from my data using script_fields

, but got inconsistent results.

My display:

curl -XPUT localhost:9200/test/user/_mapping -d '
{
  "user": {
    "properties": {
      "id": {
        "type": "string",
        "index": "not_analyzed"
      },
      "other_ids": {
        "type": "string",
        "index": "not_analyzed"
      }
    }
  }
}
'

      

        
        
        
      

    

Some test data:

curl -XPUT localhost:9200/test/user/id1 -d '
{
  "id": "id1",
  "other_ids": [
    "id2",
    "id3"
  ]
}
'

curl -XPUT localhost:9200/test/user/id2 -d '
{
  "id": "id2",
  "other_ids": [
    "id1"
  ]
}
'

curl -XPUT localhost:9200/test/user/id3 -d '
{
  "id": "id3",
  "other_ids": [
    "id1",
    "id2"
  ]
}
'

      

        
        
        
      

    

"Simplified" query:

curl -XGET 'localhost:9200/test/user/_search?pretty=1'  -d '
{
  "fields": [
    "_source"
  ],
  "query": {
    "match_all": {}
  },
  "script_fields": {
    "other_id_script": {
      "lang": "groovy",
      "script": "doc[\"other_ids\"].values"
    }
  }
}
'

      

        
        
        
      

    

Relevant parts of the answer:

  "hits" : {
    "total" : 3,
    "max_score" : 1.0,
    "hits" : [ {
      "_source":{"id":"id1","other_ids":["id2","id3"]},
      "fields" : {
        "other_id_script" : [ [ "id1", "id2" ] ]
      }
    }, {
      "_source":{"id":"id2","other_ids":["id1"]},
      "fields" : {
        "other_id_script" : [ [ "id1", "id2" ] ]
      }
    }, {
      "_source":{"id":"id3","other_ids":["id1","id2"]},
      "fields" : {
        "other_id_script" : [ [ "id1", "id2" ] ]
      }
    } ]
  }

      

        
        
        
      

    

As we can see, the values other_id_script

differ from the current doc values other_ids

in the first two cases.

Is this a bug or am I missing something?

(The entire script can be found here: https://gist.github.com/baloghz/c27e39ad419a6f4684ab )