Excluding pages from wp_query

Hi

I will be having many search bars in my website and I do not wish to exclude some posts/page ids on each of them. I have always used the below code:

if ( ! $query->is_admin && $query->is_search ) {
        $query->set( 'post__not_in', $pages_array );
}

But this does not seem to be working with your plugin. Can you please help with this ?

Thanks.