Exclude specific pages from WP search results

Hi there,

I’ve been searching for a while now, trying to find the correct way to exclude certain pages from my WP search results. However, what I keep finding online are outdated ways of doing so, like this:

function ss_search_filter( $query ) {
    if ( !$query->is_admin && $query->is_search && $query->is_main_query() ) {
        $query->set( 'post__not_in', array( 1, 2, 3 ) );
    }
}
add_action( 'pre_get_posts', 'ss_search_filter' );

Is there someone who could give me an updated version of this. Or at least tell me what has changed since then? For now, I’ll keep searching. If I DO come across some new code, I’ll post it here.

Thank you!