code: public JobStatus withIndeterminantProgress() {
      return new JobStatus(jobId, description, state, Double.NaN, status, eventId);
    }
docs: Creates a copy of this <code>JobStatus</code> with the progress set to
  an indeterminant value (<code>Double.NaN</code>).
  @return A copy of this <code>JobStatus</code> with the progress set to
  indeterminant.