protected StringBuilder appendTimestamp(final StringBuilder buf) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        append(buf, "timestamp", () -> FessFunctions.formatDate(systemHelper.getCurrentTime()));
        return buf;
    }

    protected StringBuilder appendException(final StringBuilder buf, final Exception exception) {
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream();

        validate(form, messages -> {}, this::asIndexHtml);
        verifyTokenKeep(this::asIndexHtml);

        final String diagnosticId = "log" + new SimpleDateFormat("yyyyMMddHHmm").format(ComponentUtil.getSystemHelper().getCurrentTime());
        return asStream(diagnosticId + ".zip").contentTypeOctetStream().stream(out -> {
            try (ZipOutputStream zos = new ZipOutputStream(out.stream())) {
                writeLogFiles(zos, diagnosticId);

        }
        // url
        putResultDataBody(dataMap, fessConfig.getIndexFieldUrl(), url);
        // created
        final Date now = systemHelper.getCurrentTime();
        putResultDataBody(dataMap, fessConfig.getIndexFieldCreated(), now);
        // TODO anchor
        putResultDataBody(dataMap, fessConfig.getIndexFieldAnchor(), StringUtil.EMPTY);
        // mimetype

        return requestManager.findUserBean(FessUserBean.class).map(FessUserBean::getUserId).orElse(Constants.GUEST_USER);
    }

    public Date getCurrentTime() {
        return new Date(getCurrentTimeAsLong());
    }

    public long getCurrentTimeAsLong() {
        return System.currentTimeMillis();
    }

        }
        // url
        putResultDataBody(dataMap, fessConfig.getIndexFieldUrl(), url);
        // created
        final Date now = systemHelper.getCurrentTime();
        putResultDataBody(dataMap, fessConfig.getIndexFieldCreated(), now);
        // anchor
        putResultDataBody(dataMap, fessConfig.getIndexFieldAnchor(), getAnchorList(document, responseData));