Values:
STATE_UNSPECIFIED (0):
This is an illegal state and should not be
encountered.
CREATING (1):
A volume for the restore was identified and
restore process is about to start.
RESTORING (2):
The volume is currently being restored.
SUCCEEDED (3):
The volume has been successfully restored.
FAILED (4):
The volume restoration process failed.
DELETING (5):
This VolumeRestore resource is in the process
of being deleted.
