Having deleted attributes from an entity, the fulltext search still finds the entity on the deleted content. It seems that the data isn't deleted from the fulltext index. This is a very serious bug in my opinion - it causes mistaken results, and users have no way to correct the mistakes (apart from reindexing which isn't for ordinary users and seems to be risky on larger databases).
devel. branch (cleanup_before_release), using Mysql fulltext