This has been asked before (I googled!), but I thought I'd seen some
recent-or-maybe-not-that recent changes in ES about the special _version
field and being able to do 'something' extra with it other than it's use as
the Optimistic Locking pattern.
Certainly in ES 0.19 one can't query it, but is that still the case in more
recent ES versions at all? Just wanted to confirm if my memory of seeing
something in this area is incorrect.
My use case is External Versioning using timestamps as the version, so
being able to query items changed since a certain time would be useful. I
could index a separate "queryableVersion" field with the same value, but
maybe there's a better way.
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