We have identified that the search box at the top of NU Service in the analysts view produces the following error when searching with free text.

“There has been an unexpected error. Click Continue to return to the previous page.
Could not find file ‘\\campus\ha\ITSM\LIVE\KB\index\_e.cfs’.”

We have a problem record open (4000074) and are investigating the issue.

I can confirm that the search works when searching on a ticket reference.