Add custom post types to WordPress search. Code example

function somarket_search_all( $query ) {
	if ( $query->is_search ) {
		$query->set( 'post_type', array(
			'post', 'page', 'products', 'wiki', 'places', 'product'
		) );
	}
	return $query;
}
add_filter( 'the_search_query', 'somarket_search_all' );