How to Exclude Custom Post Type from Search in WordPress?

        
        function wps_filter_search($query) {
            if (!$query->is_admin && $query->is_search) {
            $query->set('post_type', array('post', 'page', 'book'));
            }
            return $query;
            }
        add_filter('pre_get_posts', 'wps_filter_search');