Exclude pages from search in WordPress

Add this to your functions.php file in theme folder.

/**
* Exclude pages from search
*/
function remove_pages_from_search($query) {
 if ($query->is_search) {
   $query->set('post_type', 'post');
  };
return $query;
};
add_filter('pre_get_posts','remove_pages_from_search');