Edit the pages which the undefined pages are mentioned on, and remove or correct their link to the undefined page. (i.e. work through the right hand column in your list)
The "undefined pages" label for these does not explain what they really are. They're not pages, they are "pages that do not exist, but are linked to by other pages". It's a common thing to do in a wiki - write a page, putting in links to other pages that don't exist as a reminder to create the targets later. But many humans get the names wrong, and a lot of us forget to go back over and create new linked pages (or forget to ask other people to add the pages)
Eh? That's nonsense. The whole point of these undefined pages is that there is nothing there to delete, they're not pages, they're pointers to pages that are not there.
There's no removing them, other than by deleting the actual pointers you've got in the pages that are pointing at things that aren't there.
If Atlassian have "removed them", they've done it by deleting the links from your content, not by indexing (although, the list is being drawn from the index, and if you've actually removed the links from the pages and something went wrong with the post-edit indexing, then re-indexing would remove them from the list. But you've still had to edit the pages with the links, and you really need to look at why the indexing is failing)
Hmm, I'd be worried about why the standard indexing is not working. That sort of behaviour is something that I've always ended up investigating and finding a broken installation. But, it's Cloud, something that Atlassian would need to investigate.
We’re excited to introduce external collaboration for Confluence, now available in early access. It is available to preview for Confluence Cloud Premium and Enterprise customers. (If you're not on ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events