Issue Summary

This is reproducible on Data Center: yes

Steps to Reproduce

1. Generate site backup (doesn't matter whether it's from old (prior 8.3.0) or new backup system)
2. Go to General configuration -> Backup and restore
3. Restore site from the backup (preferably at the same instance)
4. Check that content could be found
5. Create new page
6. Try to search for that page

Expected Results

Page could be found without additional actions

Actual Results

There is a big chance that page will not be indexed as it's journal entry id is smaller than what was set as a maximum id before restore:

11:08:51,097 WARN [http-nio-8080-exec-5 url: /confluence/pages/createpage.action; user: admin] [impl.journal.DefaultJournalManager] enqueue Newly enqueued entry in journal [main_index] has an ID [1] that should have been higher than the journal state store's most-recent-id [52]. it is likely that this node's journal state store is corrupt.
 -- url: /confluence/pages/createpage.action | userName: admin | action: createpage | referer: http://localhost:8080/confluence/ | traceId: 6e426cb004c74b19

Workaround

Stop Confluence, delete all content from <confluence-home>/journal table. Start Confluence again - full re-index will be done after that.