Maintain original timestamp across versions

I have enabled automatic _timestamp on my indexes but every time an index
is updated during a _bulk request (or a regular update) the timestamp is
also updated. This makes sense.

I want to know if there's a way to keep the original timestamp after an
update? So we only ever see the timestamp for version 1 no matter how many
times it is updated to a new version.

I have over 4 millions indexes and bulk update in chunks of 1000 so I'd
rather not iterate through every single item to compare timestamps.

Any tips?

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