User complained about a lost page - could not find it using search. Found it with a database query to track down location and eventually found it as a live page. I was able to reproduce the problem by following the scenario:

1) Create a new page with some unique text that can be searched for
2) restrict permission to "myself" for both view and edit
3) save
4) Run a search and verify the document can be found (might have to wait a few minutes for the indexer to run)
5) edit the same page and just change the permissions to allow anyone to view and edit
6) Run the same search (after a wait for the indexer) - page can not be found

Editing and updating the page will bring the page back into the index.
There were no errors in the catalina log.