Can MirrorMaker can work across different major versions of Kafka, specifically 
from a v10 producer to a v8 consumer?

I suspect, given that the client API is not backwards compatible, that the 
answer unfortunately is no.
But it would be useful to get a definitive answer on that, and any suggestions 
in case the answer is no.

The context is that I have a Kafka cluster at version 10 so that I can use the 
Kafka Connect capability.  One of the target sinks is a Kafka cluster at 
version 8 but I suspect Kafka Connect will not be able to communicate with this 
cluster because the client version doesn't match the target cluster.

There is no scope to upgrade the Kafka 8 cluster.

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