private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.RecognitionResponseMetadata,
            com.google.cloud.speech.v2.RecognitionResponseMetadata.Builder,
            com.google.cloud.speech.v2.RecognitionResponseMetadataOrBuilder>
        getMetadataFieldBuilder() {
      if (metadataBuilder_ == null) {
        metadataBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.RecognitionResponseMetadata,
                com.google.cloud.speech.v2.RecognitionResponseMetadata.Builder,
                com.google.cloud.speech.v2.RecognitionResponseMetadataOrBuilder>(
                getMetadata(), getParentForChildren(), isClean());
        metadata_ = null;
      }
      return metadataBuilder_;
    }
<pre>
Metadata about the recognition.
</pre>

<code>.google.cloud.speech.v2.RecognitionResponseMetadata metadata = 2;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/BatchRecognizeResults.java