public String getUnmarshallingType() {
        if(isJsonValue()) {
            return "JSON_VALUE";
        }

        return null;
    }
Currently used only for JSON services.

@return The Marshalling type to use when loading the unmarshaller from the {@link JsonUnmarshallerContext}. Must be
a field of {@link JsonUnmarshallerContext.UnmarshallerType}. This will be null if the default simple-type
marshaller should be used.
aws-java-sdk-code-generator/src/main/java/com/amazonaws/codegen/model/intermediate/MemberModel.java