Currently I have a use case where I have to do some calculation on the time, therefore I need to use date filter plugin in order to parse dates from field.
But I dont want to use that date or timestamp as the logstash timestamp for the event as it is not correct.
You can just set the target field of the filter to something other than @timestamp, e.g. target => "[@metadata][temp_ts]". Then you'll have a field with the result that won't appear in your output.
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