apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/AppNamespaceService.java/AppNamespaceService/update
class AppNamespaceService:  public AppNamespace update(AppNamespace appNamespace) {
    AppNamespace managedNs = appNamespaceRepository.findByAppIdAndName(appNamespace.getAppId(), appNamespace.getName());
    BeanUtils.copyEntityProperties(appNamespace, managedNs);
    managedNs = appNamespaceRepository.save(managedNs);

    auditService.audit(AppNamespace.class.getSimpleName(), managedNs.getId(), Audit.OP.UPDATE,
                       managedNs.getDataChangeLastModifiedBy());

    return managedNs;
  }