@java.lang.Override
  public com.google.protobuf.ByteString getLanguageCodeBytes() {
    java.lang.Object ref = languageCode_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      languageCode_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
Required. The language of the supplied audio as a
[BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt) language tag.
Example: "en-US".
See [Language
Support](https://cloud.google.com/speech-to-text/docs/languages) for a list
of the currently supported language codes.
</pre>

<code>string language_code = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for languageCode.
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/RecognitionConfig.java