Wordpress - How do I remove Pages from search?

The below should make the page post type no longer search-able.

function remove_pages_from_search() {
    global $wp_post_types;
    $wp_post_types['page']->exclude_from_search = true;
}
add_action('init', 'remove_pages_from_search');

The following in functions.php also works well:

//Remove pages from search results
function mySearchFilter($query) {
if ($query->is_search) {
$query->set('post_type', 'post');
}
return $query;
}
add_filter('pre_get_posts','mySearchFilter');