How does one flush an entry from redis?

[txtsd via Unbound-users]

I've configured unbound to use redis as a backend.

I now have one erroneous entry cached in redis. I'm unable to flush that 
particular domain from the redis cache by doing:
`unbound-control flush domain.tld`. It only flushes unbound's in-memory 
cache.

When I `dig domain.tld` it keeps returning the incorrect cached IP.

What do?

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txtsd