public Content getContent() {
        for (ConfigModel m : configModels) {
            if (m instanceof Content) {
                return (Content)m;
            }
        }
        return null;
    }
Initialize part 2.:
Prepare all config models for starting. Must be called after plugins are loaded and frozen.
config-model/src/main/java/com/yahoo/config/model/ConfigModelRepo.java