Add field to search results

Elastic Stack Elasticsearch
1

Hi,
I want to set field value in search results.
Let's say for some documents field xxx is not so I need to set the value based on other fields.
I tried to use a simple script below but it only adds fields object but not a field inside _source

    {
        "query": { ... }
        "script_fields": {
            "sample_script": {
                "script": {
                    "lang": "painless",
                    "source": "params._source.title"
                }
            }
        }
    }

Is there a way to set value for _source.xxx using script?

2

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