I noticed the timestamp and @timestamp field are always same and set to build start timestamp. Is it possible to log line generation time ? I was very confused that we have 2 timestamp dates (already fixed in 1.1.1) with same value. I expected data['timestamp'] to be build timestamp and @timestamp to be line timestamp.

Is it by design imposible to get the current time into @timestamp ? Maybe if you do not want to implement it by yourself - reading from files generated by Timestamper could be the solution.