I do and it is working correctly.
holidays.csv
holiday,type,holiday_description
25-12-2015,global,christmas
16-02-2015,global,presidents day
transforms.conf
[holidays]
filename = holidays.csv
min_matches = 1
props.conf
EVAL-holiday = strftime(_time,"%d-%m-%Y")
LOOKUP-isaholiday = holidays holiday OUTPUTNEW
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