Admin/Order/edit.twig:
    - [onRenderAdminOrderEdit, NORMAL]

    /**
     * 受注登録ページで店舗検索情報をajaxリクエストに渡す.
     *
     * @param TemplateEvent $event
     */
    public function onRenderAdminOrderEdit(TemplateEvent $event)
    {
        $source = $event->getSource();

        $search = "'category_id' : $('#admin_search_product_category_id').val()";
        $replace = $search.",'plg_test_id' : $('#admin_search_product_plg_test_id').val()";
        $source = str_replace($search, $replace, $source);

        $event->setSource($source);
    }