Values:
STATE_UNSPECIFIED (0):
Invalid.
RUNNING (1):
Request is being processed.
SUCCEEDED (2):
The batch is processed, and at least one item
was successfully processed.
FAILED (3):
The batch is done and no item was
successfully processed.
CANCELLING (4):
Request is in the process of being canceled
after caller invoked
longrunning.Operations.CancelOperation on the
request id.
CANCELLED (5):
The batch is done after the user has called
the longrunning.Operations.CancelOperation. Any
records processed before the cancel command are
output as specified in the request.