How to disable search function

How can I remove search function (website.com/?s=) in WordPress?

Add this script to you functions file:

<?php
/**
* Redirect Search to home page
**/
add_action('template_redirect','wpster_search_redirect');
function wpster_search_redirect() {
 global $wp_rewrite;
 if(is_search()&&isset($_GET['s'])) {
  $s = sanitize_text_field($_GET['s']);
  $location = '/';
  $location = home_url($location);
  wp_safe_redirect($location,301);
  exit;
 }
}
?>