Couldn't find cluster after upgrade

I have a cluster with one node.
I’ve upgraded Couchbase Server (Enterprise Edition) from version 6.0.0 to 6.5.0 (CentOS 7).

The command for updating:
yum update couchbase-server-6.5.0-4960

Update completed successfully.

But after updating the old cluster doesn’t find.

Using old link 192.168.0.27:8091/ui/index.html#!/overview suggest me to create/join cluster. But it will be the new one without data.

When I’ve created new cluster with the new node with the same IP: 192.168.0.27 I’ve checked logs. There are was the info that old buckets (all my data) was deleted.

Why? What I do wrong?

No need anymore, thanks.