}

        if (targetPrefixes.isEmpty()) {
            saveError(messages -> messages.addErrorsNoTargetIndexSelected(GLOBAL));
            return redirect(getClass());
        }

        final CoordinatorHelper coordinator = ComponentUtil.getCoordinatorHelper();
        if (!coordinator.tryStartOperation("reindex_config")) {
            saveError(messages -> messages.addErrorsOperationAlreadyRunning(GLOBAL,

            systemProperties.store();
        } catch (final Exception e) {
            logger.warn("Failed to send a test mail.", e);
            saveError(messages -> messages.addErrorsFailedToSendTestmail(GLOBAL));
        }

        return redirectByParam(AdminGeneralAction.class, "notificationTo", form.notificationTo);
    }

    /**