Code-Snippets-Functions/Execute a function on a child site/WordPress/post-only-search.txt

if (!is_admin()) {

function keep_only_posts_in_search($query) {
if ($query->is_search) {
$query->set('post_type', 'post');
}

return $query;
}

add_filter('pre_get_posts','keep_only_posts_in_search');
}