We also need this feature. Many tickets are generated straight from our users and they generally do not include useful information in the description. There are also many times where additional information is found after the ticket has already been created and added to the comments. The old version allowed the ability to search through the ticket (User and Technician comments).
As it stands, all the additional information we add to the tickets to use for future reference is incredibly difficult to use effectively because of the inability to search.