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<?php
function wpb_filter_query( $query, $error = true ) {
  if ( is_search() ):
    $query->is_search = false;
    $query->query_vars[s] = false;
    $query->query[s] = false;
    
    if ( $error == true )
      $query->is_404 = true;
  endif;
}

add_action( 'parse_query', 'wpb_filter_query' );
?>