String url = DocumentUtil.getValue(document, fessConfig.getIndexFieldUrl(), String.class);

        if (StringUtil.isBlank(url)) {
            return "#not-found-" + DocumentUtil.getValue(document, fessConfig.getIndexFieldDocId(), String.class);
        }

        final boolean isSmbUrl = url.startsWith("smb:") || url.startsWith("smb1:");
        final boolean isFtpUrl = url.startsWith("ftp:");