$search_terms = ee()->input->get_post('filter_by_keyword');

        if ($search_terms) {
            $files->search(['title', 'file_name', 'mime_type'], $search_terms);
            $vars['search_terms'] = htmlentities($search_terms, ENT_QUOTES, 'UTF-8');
            $needToFilterFiles = true;
        }

$files->search(['title', 'description', 'location', 'credit', 'file_name', 'mime_type'], $search_terms);