Add custom search field in wp admin default search edit

This will add new search field in custom post type default search field

/*     add search option by job id in wp admin     */
add_filter('posts_where', 'posts_where');

function posts_where($where) {

global $wpdb;
$curent_posttype = $_GET['post_type'];

if ($curent_posttype == 'jobs') {
$where .= " OR ID IN (SELECT post_id FROM bh_job_id_assignment WHERE id='{$_GET['s']}' )"; //"bh_job_id_assignment" custom table
}

return $where;
}