Splunk Enterprise

Rename field names to result of an eval


I have a simple flat data table in splunk enterprise 8.02 that has values in a field called UK_0 for current month quantities and UK_1 for the previous month up to UK_6 for six months ago.  I am trying to replace these field names with the actual month names using an eval on now() to get month names 



| eval thismonth=strftime(now(),"%B"), lastmonth = strftime(relative_time(now(),"-1mon"),"%B")
|stats  Values("Service provider") as "Service Provider" values(part_id) as "Part Number"  values(UK_1) as lastmonth values(UK_0) as thismonth  by "Part Info"



the above simply replaces the UK_0 with the heading "thismonth" rather than June.  how do i get it to say May and June rather than UK_1 & UK_0 ?

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| makeresults 
| fillnull UK_0 UK_1 UK_6 
| foreach UK_* [ eval month_<<MATCHSTR>>=strftime(relative_time(now(),-1*tonumber(<<MATCHSTR>>)."month@month"),"%B")
| eval {month_<<MATCHSTR>>}=<<FIELD>>]
| fields - *_*

After calculating, convert it like this

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