@java.lang.Override
  public com.google.protobuf.ByteString getModelBytes() {
    java.lang.Object ref = model_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      model_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
Optional. The language detection model to be used.

Format:
`projects/{project-number-or-id}/locations/{location-id}/models/language-detection/{model-id}`

Only one language detection model is currently supported:
`projects/{project-number-or-id}/locations/{location-id}/models/language-detection/default`.

If not specified, the default model is used.
</pre>

<code>string model = 4 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for model.
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/DetectLanguageRequest.java