private Map<String, Object> fields;

    @Override
    public String getId() {
        return asDocMeta().id();
    }

    public void setId(final String id) {
        asDocMeta().id(id);
    }

    @Override
    public Long getVersionNo() {
        return asDocMeta().version();
    }

    public void setVersionNo(final Long version) {
        asDocMeta().version(version);
    }

    @Override
    protected String getNamePrefix() {
        return NAME_PREFIX;
    }

    @Override
    protected String getApiPath() {
        return API_PATH;
    }

    @Override
    protected String getKeyProperty() {
        return KEY_PROPERTY;
    }

    @Override
    protected String getListEndpointSuffix() {
        return LIST_ENDPOINT_SUFFIX;
    }

    @Override

    @Override
    protected String getNamePrefix() {
        return NAME_PREFIX;
    }

    @Override
    protected String getApiPath() {
        return API_PATH;
    }

    @Override
    protected String getKeyProperty() {
        return KEY_PROPERTY;
    }

    @Override
    protected String getListEndpointSuffix() {
        return LIST_ENDPOINT_SUFFIX;
    }

    @Override

  protected final @Nullable T endOfData() {
    state = State.DONE;
    return null;
  }

  @Override
  public final boolean hasNext() {
    checkState(state != State.FAILED);
    switch (state) {
      case DONE:
        return false;
      case READY:
        return true;
      default:
    }
    return tryToComputeNext();
  }

  private boolean tryToComputeNext() {

     *
     * @return the count of bytes written
     */
    public long getCount() {
        return this.count;
    }

    @Override
    protected int writeParameterWordsWireFormat(final byte[] dst, final int dstIndex) {
        return 0;
    }

    @Override
    protected int writeBytesWireFormat(final byte[] dst, final int dstIndex) {
        return 0;
    }

    @Override

        return 0;
    }

    @Override
    protected int readParametersWireFormat(final byte[] buffer, final int bufferIndex, final int len) {
        return 0;
    }

    @Override
    protected int readDataWireFormat(final byte[] buffer, final int bufferIndex, final int len) {
        return 0;
    }

    @Override
    public String toString() {

        dstIndex += writeString(path, dst, dstIndex);

        return dstIndex - start;
    }

    @Override
    int writeDataWireFormat(final byte[] dst, final int dstIndex) {
        return 0;
    }

    @Override
    int readSetupWireFormat(final byte[] buffer, final int bufferIndex, final int len) {
        return 0;
    }

    @Override

        }

        return dstIndex - start;
    }

    @Override
    int writeDataWireFormat(final byte[] dst, final int dstIndex) {
        return 0;
    }

    @Override
    int readSetupWireFormat(final byte[] buffer, final int bufferIndex, final int len) {
        return 0;
    }

    @Override

                kryo.setWarnUnregisteredClasses(true);
            }
            return kryo;
        });
    }

    /**
     * Gets the configured serializer type from the Fess configuration.
     *
     * @return the serializer type (either "kryo" or "javabin")
     */
    protected String getSerializerType() {
        return ComponentUtil.getFessConfig().getCrawlerDataSerializer();
    }

    /**

     * @param id The ID of the directory to list.
     * @return A JSON response containing the list of files and directories.
     */
    @Execute
    public JsonResponse<ApiResult> list(final OptionalThing<String> id) {
        final List<Map<String, Object>> list = getFileItems(id.isPresent() ? decodePath(id.get()) : null);
        try {