elasticsearch script_score custom score function: how to replace missing values?

Question

I am looking at elasticsearch's documentation for how to create a script for a custom score function which uses fields that are not queried for scoring at this link.

From what I can see you build a script function like so:

"script_score" : {
    "script" : {
      "lang": "painless",
      "inline": "_score * doc['my_numeric_field'].value"
    }
}

but I am wondering what is the syntax for replacing doc['my_numeric_field'].value if it is missing?

you can place a null check for this field in the script doc['my_numeric_field'].value — user3775217
– user3775217, Commented Apr 1, 2017 at 18:05
Yes, that's what I'm doing although I haven't found great documentation on what I can do here. — user3494047
– user3494047, Commented Apr 3, 2017 at 14:29
@user3775217 How do you make a null check ? I'm getting some errors like cannot convert MethodHandle(Doubles)double to (Object)boolean when I try to use ternary operators float_can_be_null ? float : some_default — Cyril Duchon-Doris
– Cyril Duchon-Doris, Commented Mar 23, 2018 at 14:19

Stefan Ocke · Accepted Answer · 2018-05-29 15:23:03Z

1

For me, the following worked (my version is 6.2.4):

          "script_score" : {
            "script" : {
              "source": "doc.containsKey('my_numeric_field') ? doc['my_numeric_field'].value : 0"
            }
        },

Found it at:

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

edited May 29, 2018 at 15:23

answered May 29, 2018 at 15:17

Stefan Ocke

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rkm · Accepted Answer · 2018-09-26 13:26:41Z

1

Question is old, but maybe my answer would be useful for someone.

You should use size in order to check if value is missing:

doc['field'].size() == 0

answered Sep 26, 2018 at 13:26

rkm

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