Add custom post types to index

// add custom post types to index
function add_cpts_to_index($query) {
	if($query->is_tax && false == $query->query_vars['suppress_filters']) {
		$query->set('post_type', array('post', 'employee', 'project', 'recprogram', 'partner', 'testimonial', 'destination', 'capitalprogram', 'class', 'tribe_events'));
	}
	return $query;
}
add_filter('pre_get_posts', 'add_cpts_to_index');