// functions.php

add_action( 'init', 'updateSidebarsPostType', 99 );

/**
 * updateSidebarsPostType
 *
 * @author  Joe Sexton <joe@webtipblog.com>
 */
function updateSidebarsPostType() {
	global $wp_post_types, $wp_rewrite;

	if ( post_type_exists( 'multiple-sidebars' ) ) {

		// exclude from search results
		$wp_post_types['multiple-sidebars']->exclude_from_search = true;
	}
}