Example CLI usage (from honeytail root)
honeytail -p csv -k $HONEYTAIL_WRITEKEY \
-f some/path/system.log \
--dataset 'MY_TEST_DATASET' \
--backfill \
--csv.fields="time,field_1,field_2,field_3"
--csv.timefield="time" \
--csv.time_format="%H:%M:%S"