}

    // GET /api/admin/backup/file/{id}
    @Execute
    public StreamResponse get$file(final String id) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (stream(fessConfig.getIndexBackupAllTargets()).get(stream -> stream.anyMatch(s -> s.equals(id)))) {
            if ("system.properties".equals(id)) {
                return asStream(id).contentTypeOctetStream().stream(out -> {

            }
            return null;
        }
    }

    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public ActionResponse download(final String id) {
        if (stream(fessConfig.getIndexBackupAllTargets()).get(stream -> stream.anyMatch(s -> s.equals(id)))) {
            if ("system.properties".equals(id)) {
                return asStream(id).contentTypeOctetStream().stream(out -> {

        return Constants.TRUE.equalsIgnoreCase(getIndexerThreadDumpEnabled());
    }

    String getIndexBackupTargets();

    String getIndexBackupLogTargets();

    default String[] getIndexBackupAllTargets() {
        return split(getIndexBackupTargets() + "," + getIndexBackupLogTargets(), ",")
                .get(stream -> stream.filter(StringUtil::isNotBlank).map(String::trim).toArray(n -> new String[n]));
    }