XFES / Enhanced Search: I need to search also on an extra column

Hello all!
I have the following issue for which I need some help.

I have this part of code to make a search for nodes (I use also Enhanced Search / Elastic Search).
PHP:

        $input = [
            'search_type' => 'node',
            'keywords' => $keywords,
            'c' => [],
            'c.title_only' => 1,
            'c.newer_than' => 0,
            'c.older_than' => 0,
            'c.users' => '',
            'c.content' => '',
            'c.type' => 'node'...

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