The Operation enumerated type defines the supported vCenter appliance deployment operations.
INSTALL : The appliance installation is in progress.
UPGRADE : The appliance upgrade is in progress.
MIGRATE : The appliance migration is in progress.
RESTORE : The appliance restoration is in progress.
ROLLBACK : The appliance is being rolled back to an unconfigured state.
Enumeration: INSTALL, UPGRADE, MIGRATE, RESTORE, ROLLBACK,