How to apply a rangemap to string values?

Hi Splunkers! I am running the following search to try and apply a "low" rangemap value if a string matches "up", and a "severe" rangemap value if the string matches "down", but I can' t get the eval field to show in the search results. Here is the search I am using: index=f5 pool | head 1 | eval alert_level = case(F5_TCPStatus=="up",1,F5_TCPStatus=="down",0) | rangemap field=alert_level low=1-1 elevated=2-2 severe=3-3 Thanks for any help! JB