Skip expired backfills instead of returning error #1674
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What this PR does / Why we need it:
If a single backfill has expired it would cause the whole FetchMatches call to error out. Now instead the backfill will be skipped, similar to the
NotFoundcase.The status code returned for attempting to acknowledge or update an expired backfill is changed from Unavailable since the operation is not retryable. I opted for
FailedPrecondition, but maybeInvalidArgumentcould make more sense since you can't "revive" the backfill, only create a new one if it expired.Special notes for your reviewer:
There are some formatting changes from format-on-save, let me know if I should remove them to make the PR clearer.