The search function was removed because it made the system overheat having multiple people using the function at the same time.
It was made restricted to the general public and only people with Toriprime or higher may use it.

suo says: No. It just made the database go slow. Which is far more important, because servers should not overheat because of a single function. The database going slow, however, makes everyone unhappy and can't be fixed by getting a better hosting plan.