Filebeat timestamp on docker input

In case of docker input, filebeat attaches the @timestamp field from the docker timestamp. I want to capture the time when filebeat actually read this log along with the docker timestamp in a field, say, @filebeattimestamp. I couldn't find any way to do this. No processor seems to do this, neither does the fields parameter help.

Can anyone tell me on how to achieve this?

It's not possible to keep that timestamp. Do you mind opening an issue on Github?

Sure. https://github.com/elastic/beats/issues/8279

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