Exclude specific pages from search query

functions.php

function jp_search_filter( $query ) {
  if ( $query->is_search && $query->is_main_query() ) {
    // unset certain pages
    $query->set( 'post__not_in', array( 10,11,20,105 ) ); 
    // setup certain categories
  	$query->set('cat',array('stores'));
    // setup certain post types
  	$query->set( 'post_type', array( 'post', 'movies', 'products', 'portfolio' ) );
  }
}
add_filter( 'pre_get_posts', 'jp_search_filter' );