code: public Task configureEvcMode_Task(String evcModeKey) throws RuntimeFault, RemoteException, EVCConfigFault {
          ManagedObjectReference task = getVimService().configureEvcMode_Task(getMOR(), evcModeKey);
          return new Task(getServerConnection(), task);
      }
docs: Set the EVC mode. If EVC is currently disabled, then this will enable EVC.
  The parameter must specify a key to one of the EVC modes listed in the supportedEVCMode
  array property. If there are no modes listed there, then EVC may not currently be enabled;
  reference the other properties in EVCState to determine what conditions are blocking EVC.
  
  @param evcModeKey A key referencing the desired EVC mode.
  @return Task with which to monitor the operation
  @throws RuntimeFault
  @throws RemoteException