@java.lang.Override
  public Builder newBuilderForType() {
    return newBuilder();
  }
<pre>
The language code of the user.
</pre>

<code>optional string language_code = 2;</code>

@return The bytes for languageCode.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/RetrievalConfig.java