private static Element getImplicitAdmin(DeployState deployState) {
        String defaultAdminElement = deployState.isHosted() ? getImplicitAdminV4() : getImplicitAdminV2();
        log.log(Level.FINE, () -> "No <admin> defined, using " + defaultAdminElement);
        return XmlHelper.getDocument(new StringReader(defaultAdminElement)).getDocumentElement();
    }
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