@SuppressWarnings({"rawtypes"})
    protected com.google.protobuf.MapFieldReflectionAccessor internalGetMapFieldReflection(
        int number) {
      switch (number) {
        case 8:
          return internalGetLabels();
        default:
          throw new RuntimeException("Invalid map field number: " + number);
      }
    }
<pre>
A document translation request.
</pre>

Protobuf type {@code google.cloud.translation.v3beta1.TranslateDocumentRequest}
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/TranslateDocumentRequest.java