public Builder mergeUpdateTransferJobFieldMask(com.google.protobuf.FieldMask value) {
        if (updateTransferJobFieldMaskBuilder_ == null) {
          if (((bitField0_ & 0x00000008) != 0)
              && updateTransferJobFieldMask_ != null
              && updateTransferJobFieldMask_
                  != com.google.protobuf.FieldMask.getDefaultInstance()) {
            getUpdateTransferJobFieldMaskBuilder().mergeFrom(value);
          } else {
            updateTransferJobFieldMask_ = value;
          }
        } else {
          updateTransferJobFieldMaskBuilder_.mergeFrom(value);
        }
        if (updateTransferJobFieldMask_ != null) {
          bitField0_ |= 0x00000008;
          onChanged();
        }
        return this;
      }
<pre>
The field mask of the fields in `transferJob` that are to be updated in
this request.  Fields in `transferJob` that can be updated are:
[description][google.storagetransfer.v1.TransferJob.description],
[transfer_spec][google.storagetransfer.v1.TransferJob.transfer_spec],
[notification_config][google.storagetransfer.v1.TransferJob.notification_config],
[logging_config][google.storagetransfer.v1.TransferJob.logging_config], and
[status][google.storagetransfer.v1.TransferJob.status].  To update the
`transfer_spec` of the job, a complete transfer specification must be
provided. An incomplete specification missing any required fields is
rejected with the error
[INVALID_ARGUMENT][google.rpc.Code.INVALID_ARGUMENT].
</pre>

<code>.google.protobuf.FieldMask update_transfer_job_field_mask = 4;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferProto.java