code: public OperationFuture<List<Server>> modify(ServerFilter serverFilter, ModifyServerConfig modifyServerConfig) {
          List<Server> serverList = find(serverFilter)
              .stream()
              .map(ServerMetadata::asRefById)
              .collect(toList());
  
          return modify(serverList, modifyServerConfig);
      }
docs: Modify servers by filter
  @param serverFilter server filter
  @param modifyServerConfig server config
  @return OperationFuture wrapper for list of Servers