private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.translate.v3.Model,
            com.google.cloud.translate.v3.Model.Builder,
            com.google.cloud.translate.v3.ModelOrBuilder>
        getModelFieldBuilder() {
      if (modelBuilder_ == null) {
        modelBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.translate.v3.Model,
                com.google.cloud.translate.v3.Model.Builder,
                com.google.cloud.translate.v3.ModelOrBuilder>(
                getModel(), getParentForChildren(), isClean());
        model_ = null;
      }
      return modelBuilder_;
    }
<pre>
Required. The Model to create.
</pre>

<code>.google.cloud.translation.v3.Model model = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/CreateModelRequest.java