Confluence pages are not resolved in subwikis

Pages are looked up using HQL on a single wiki (the main one). I'm anticipating the fact that if we migrate documents to a sub wiki, link preservation and other things related to confluence page resolution will not work well.

Unfortunately, solving this requires switching to a Solr search, which is a bit more complicated because it can't do exact matches on string properties.

And this requires switching the title property to a string from a large string ("text area"), which is possible because in Confluence, page titles are limited to 255 characters, but this will cause Solr to reindex all the Confluence pages, which takes some time on large migrations.