public Builder clearLastUpdateTime() {
      bitField0_ = (bitField0_ & ~0x00000004);
      lastUpdateTime_ = null;
      if (lastUpdateTimeBuilder_ != null) {
        lastUpdateTimeBuilder_.dispose();
        lastUpdateTimeBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Time of the most recent processing update.
</pre>

<code>.google.protobuf.Timestamp last_update_time = 3;</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/LongRunningRecognizeMetadata.java