Change post types to exclude from WP/WC searches by post content

gistfile1.php

function wc_filter_search_add_post_type( $array ) {
	array_push( $array, 'your_post_type' );
	array_push( $array, 'another_post_type' );
	array_push( $array, 'etc' );

	return array;
}
add_filter( 'wc_filter_search_not_allowed_array', 'wc_filter_search_add_post_type' );