@JsonIgnore
  public List<File> getFileList() {
    return files.stream().filter(f -> f.getFile() != null).map(FileResultModel::getFile)
        .collect(
            Collectors.toList());
  }
this saves the file data in this result model to the specified directory, and add appropriate
information to the result model to indicate the result of the file save.
this only applies to the commands that saves the file content in byte[], not download the
files over http channel
geode-gfsh/src/main/java/org/apache/geode/management/internal/cli/result/model/ResultModel.java