public OperationFuture<List<Server>> shutDown(Group... groups) {
        return serverService().shutDown(
            getServerSearchCriteria(groups)
        );
    }
public OperationFuture < List < Server > > shutDown ( Group ... groups ) { return serverService ( ) . shutDown ( getServerSearchCriteria ( groups ) ) ; }
Shut down groups of servers

@param groups groups references list
@return OperationFuture wrapper for Server list