final List<String> roleTypeList = new ArrayList<>();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (fessConfig.isFtpRoleFromFile() && responseData.getUrl().startsWith("ftp:")) {
            final String owner = (String) responseData.getMetaDataMap().get(FtpClient.FTP_FILE_USER);
            if (owner != null) {

                    }
                    final PermissionHelper permissionHelper = ComponentUtil.getPermissionHelper();
                    if (fessConfig.isSmbRoleFromFile() || fessConfig.isFileRoleFromFile() || fessConfig.isFtpRoleFromFile()) {
                        // head method
                        responseData = client.execute(RequestDataBuilder.newRequestData().head().url(url).build());
                        if (responseData == null) {

     * The value is, e.g. true <br>
     * @return The determination, true or false. (if not found, exception but basically no way)
     */
    boolean isFtpRoleFromFile();

    /**
     * Get the value for the key 'index.backup.targets'. <br>
     * The value is, e.g. fess_basic_config.bulk,fess_config.bulk,fess_user.bulk,system.properties,fess.json,doc.json <br>