Cbbackup / cbrestore

Is it possible to take a backup from couchbase 4.5 and restore in onto a 4.1 instance? I’m getting an error when I run:

bin/cbrestore backup --bucket-source=blah --bucket-destination=blah --verbose -u Administrator -p password

I’ve create the bucket blah in the target…

error: map missing vbucket_id: 810; perhaps your source does not have vbuckets; if so, try using moxi (HOST:11211) as a destination

Answered my own question. Adding -x rehash=1 did the trick.