public com.google.protobuf.Timestamp.Builder getUpdateTimeBuilder() {
      bitField0_ |= 0x00000004;
      onChanged();
      return getUpdateTimeFieldBuilder().getBuilder();
    }
<pre>
The last update time of the operation.
</pre>

<code>.google.protobuf.Timestamp update_time = 3;</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/ExportDataMetadata.java