private static IllegalArgumentException onlyModelIdInHostedException(String paramName) {
        return new IllegalArgumentException(paramName + " is configured with only a 'model-id'. " +
                                             "Add a 'path' or 'url' to deploy this outside Vespa Cloud");
    }
Expands a model config value into regular config values.
config-model/src/main/java/com/yahoo/vespa/model/container/xml/ModelIdResolver.java