public Builder mergeMetadata(com.google.cloud.speech.v1p1beta1.RecognitionMetadata value) {
      if (metadataBuilder_ == null) {
        if (((bitField0_ & 0x00080000) != 0)
            && metadata_ != null
            && metadata_
                != com.google.cloud.speech.v1p1beta1.RecognitionMetadata.getDefaultInstance()) {
          getMetadataBuilder().mergeFrom(value);
        } else {
          metadata_ = value;
        }
      } else {
        metadataBuilder_.mergeFrom(value);
      }
      if (metadata_ != null) {
        bitField0_ |= 0x00080000;
        onChanged();
      }
      return this;
    }
<pre>
Metadata regarding this request.
</pre>

<code>.google.cloud.speech.v1p1beta1.RecognitionMetadata metadata = 9;</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/RecognitionConfig.java