* Add migrations
* Handle previousTitles when titles is updated
* Add necessary test cases
* Use previous title while searching
* Rewrite logic to update previousTitles in beforeSave hook
* Update weights
* Update test to match new rank order
* Add tooltip to inform user on document
* Add code comment
* Remove previous title tooltip
* fix: Remove unused string, add model tests
Co-authored-by: Tom Moor <tom.moor@gmail.com>
