public Builder clearTransferSpec() {
        bitField0_ = (bitField0_ & ~0x00000004);
        transferSpec_ = null;
        if (transferSpecBuilder_ != null) {
          transferSpecBuilder_.dispose();
          transferSpecBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
Transfer specification.
</pre>

<code>.google.storagetransfer.v1.TransferSpec transfer_spec = 3;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java