Actually the wordpress default search on the frontend does not automatically add the custom post types to the search, so you will need to use the relevanssi plugin so that they can be indexed for the default search.
Lets try this using a different method since relevanssi isn't working out. You can add the following code to our Toolset custom code section. This can be found in Toolset -> Settings -> Custom Code where you need to add it to the file and activate it.
function cus_post_search_filter($query) {
if (!$query->is_admin && $query->is_search) {
$query->set('post_type', array('post', 'page', 'book'));
}
return $query;
}
add_filter('pre_get_posts', 'cus_post_search_filter');
To add you post types to the search just add the slugs to it.
Example
