How to use "script fields" on nested type in ElasticSearch?

Question

I want to do something like this, use script_fields to show the length of comments.

{
   "script_fields" : {
      "comments" : {
         "script" : "doc['comments'].values.size()"
     }
   }
}

but comments is a nested type. which looks like

{
   "comments": [
         {
             "k": "2016-01-06T00:00:03",
             "v": "v1 "
         },
         {
             "k": "2016-01-06T00:00:04",
             "v": "v2"
         }
   ]
}

so I want to know "how to use "script fields" on nested type in ElasticSearch?".

Thanks. "script": "_source.comments.values.size()" did work. — rongdong.bai
– rongdong.bai, Commented Mar 28, 2016 at 12:36

groenhen · Accepted Answer · 2019-02-26 11:22:31Z

4

This script should work:

"script_fields": {
    "custom_field": {
        "script": {
            "lang": "painless",
            "source": "params['_source']['comments'].size()"
        }
    }
}

edited Feb 26, 2019 at 11:22

groenhen

3,02725 gold badges51 silver badges69 bronze badges

answered Feb 26, 2019 at 8:36

haitao

413 bronze badges

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1 Comment

simply good Over a year ago

is it possible to perform script not for aggregation, like .size(). but for inner field for each nested object? like params['_source']['comments']['likeCount'] * 2

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