I created a book store and created “Author” taxonomies using advanced custom fields.

I would like to improve my product search results on Woocommerce. Now it’s like an author’s books only appear in search results when their name appears in the title or product description.
I would like the search results to show all books related to a given author after entering his name.

I’m testing code I found on the forum: Enable custom taxonomies in WooCommerce product search

Unfortunately, it does not affect search results in any way.

add_filter( 'posts_search', 'woocommerce_search_product_tag_extended', 999, 2 );
function woocommerce_search_product_tag_extended( $search, $query ) {
    global $wpdb, $wp;

    $qvars = $wp->query_vars;

    if ( is_admin() || empty($search) ||  ! ( isset($qvars['s'])
    && isset($qvars['post_type']) && ! empty($qvars['s'])
    && $qvars['post_type'] === 'product' ) ) {
        return $search;
    }
    
    // Here set your custom taxonomy
    $taxonomy = 'autorzy'; // WooCommerce product tag

    // Get the product Ids
    $ids = get_posts( array(
        'posts_per_page'  => -1,
        'post_type'       => 'product',
        'post_status'     => 'publish',
        'fields'          => 'ids',
        'tax_query'       => array( array(
            'taxonomy' => $taxonomy,
            'field'    => 'name',
            'terms'    => esc_attr($qvars['s']),
        )),
    ));

    if ( count( $ids ) > 0 ) {
        $search = str_replace( 'AND (((', "AND ((({$wpdb->posts}.ID IN (" . implode( ',', $ids ) . ")) OR (", $search);
    }
    return $search;
}