code: @Deprecated
    public DeleteListener onBatchFailure(BatchFailureListener<Batch<String>> listener) {
      failureListeners.add(listener);
      return this;
    }
docs: When a batch fails or a callback throws an Exception, run this listener
  code.  Multiple listeners can be registered with this method.
  
  @param listener the code to run when a failure occurs
  
  @return this instance for method chaining
  @deprecated  use {@link #onFailure(BatchFailureListener)}