@java.lang.Override
  public java.lang.String getModel() {
    java.lang.Object ref = model_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      model_ = s;
      return s;
    }
  }
<pre>
Optional. The `model` type requested for this translation.

The format depends on model type:

- AutoML Translation models:
  `projects/{project-number-or-id}/locations/{location-id}/models/{model-id}`

- General (built-in) models:
  `projects/{project-number-or-id}/locations/{location-id}/models/general/nmt`,


If not provided, the default Google model (NMT) will be used for
translation.
</pre>

<code>string model = 6 [(.google.api.field_behavior) = OPTIONAL];</code>

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