The final state of human review on a processed document.
Values:
STATE_UNSPECIFIED (0):
Human review state is unspecified. Most
likely due to an internal error.
SKIPPED (1):
Human review is skipped for the document.
This can happen because human review is not
enabled on the processor or the processing
request has been set to skip this document.
VALIDATION_PASSED (2):
Human review validation is triggered and
passed, so no review is needed.
IN_PROGRESS (3):
Human review validation is triggered and the
document is under review.
ERROR (4):
Some error happened during triggering human review, see the
[state_message] for details.