Unfortunately, the docs say:
"NONE" will leave the event time set to whatever time was selected by the input layer
For data sent by splunk forwarders over the splunk protocol, the input layer will be the time that was selected on the forwarder by its input behavior (as below).
My solution was to use a batch input:
[batch://D:\data*.csv]
sourcetype = foo
move_policy = sinkhole
and the sourcetype stanza in props.conf has DATETIME_CONFIG = NONE .
NOTE batch input will DELETE files as it imports them! So make a copy first!
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