public com.google.protobuf.Timestamp.Builder getUpdateTimeBuilder() {
      bitField0_ |= 0x00000002;
      onChanged();
      return getUpdateTimeFieldBuilder().getBuilder();
    }
<pre>
The time the operation was last updated.
</pre>

<code>.google.protobuf.Timestamp update_time = 2;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/OperationMetadata.java