We use sharding, but with own persistence, but no rembember-entities 
feature.
we do rolling-restarts (yes, not advised, lot's of pain when akka cluster 
goes crazy during restart)
so we just shut down shard nodes one by one, and start new ones. Ususally 
it works.
In theory it should be possible to start new cluster in 'read-only' mode, 
reading data for persistent entities from old cluster and somehow to do the 
`switch` but there is no tools for such scenario, and it would be 
extremeally hard to guarantee that writes from 'old' cluster are persisted 
and read by 'new' cluster for the switch. So we struggle with rolling 
restarts, with all the pains involved.

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