apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ClusterService.java/ClusterService/update
class ClusterService:  @Transactional
  public Cluster update(Cluster cluster) {
    Cluster managedCluster =
        clusterRepository.findByAppIdAndName(cluster.getAppId(), cluster.getName());
    BeanUtils.copyEntityProperties(cluster, managedCluster);
    managedCluster = clusterRepository.save(managedCluster);

    auditService.audit(Cluster.class.getSimpleName(), managedCluster.getId(), Audit.OP.UPDATE,
                       managedCluster.getDataChangeLastModifiedBy());

    return managedCluster;
  }