Hey Shelly,
When you say you upgraded to Confluence 5.7 you mean the server version right? We only provided the old Confluence cluster solution to version 5.4.4 so as far as I'm aware there is no Confluence cluster version 5.7.
If you did upgraded one of the nodes to 5.7 Confluence server edition then all you need to do is to follow below guide:
https://confluence.atlassian.com/display/DOC/Moving+to+Confluence+Data+Center
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