code: public Observable<Page<NodeFile>> listFromTaskAsync(final String jobId, final String taskId, final Boolean recursive, final FileListFromTaskOptions fileListFromTaskOptions) {
          return listFromTaskWithServiceResponseAsync(jobId, taskId, recursive, fileListFromTaskOptions)
                  .map(new Func1<ServiceResponseWithHeaders<Page<NodeFile>, FileListFromTaskHeaders>, Page<NodeFile>>() {
                      @Override
                      public Page<NodeFile> call(ServiceResponseWithHeaders<Page<NodeFile>, FileListFromTaskHeaders> response) {
                          return response.body();
                      }
                  });
      }
docs: Lists the files in a task's directory on its compute node.
  
  @param jobId The ID of the job that contains the task.
  @param taskId The ID of the task whose files you want to list.
  @param recursive Whether to list children of the task directory. This parameter can be used in combination with the filter parameter to list specific type of files.
  @param fileListFromTaskOptions Additional parameters for the operation
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;NodeFile&gt; object