code: public OperationFuture<Server> delete(Server server) {
          BaseServerResponse response = client.delete(idByRef(server));
  
          return new OperationFuture<>(
              server,
              response.findStatusId(),
              queueClient
          );
      }
docs: Delete existing server
  @param server server reference
  @return OperationFuture wrapper for ServerRef