private com.google.protobuf.SingleFieldBuilderV3<
            com.google.protobuf.Timestamp,
            com.google.protobuf.Timestamp.Builder,
            com.google.protobuf.TimestampOrBuilder>
        getLastUpdateTimeFieldBuilder() {
      if (lastUpdateTimeBuilder_ == null) {
        lastUpdateTimeBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.protobuf.Timestamp,
                com.google.protobuf.Timestamp.Builder,
                com.google.protobuf.TimestampOrBuilder>(
                getLastUpdateTime(), getParentForChildren(), isClean());
        lastUpdateTime_ = null;
      }
      return lastUpdateTimeBuilder_;
    }
<pre>
Time of the most recent processing update.
</pre>

<code>.google.protobuf.Timestamp last_update_time = 3;</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/LongRunningRecognizeMetadata.java