On 20/11/2020 19:18, Uwe Schindler wrote:
> Thanks for bringing this again.
> 
> I tend to say: Let us just allow also IndexUpgrader beyodn 2 versions! If 
> somebody complains about incorrect offsets, oh man - It's their problem.

Is there any particular reason why the IndexUpgrader couldn't simply
warn about non-upgradable changes? If you have a data type that's no
longer supported and there's no migration path: error out.

I understand the whole "x != f(x)" upgrade problem, but many scenarios
should be pretty straightforward to upgrade. If a field is stored or has
docvalues, f(x) can simply be recomputed, no?

Am I missing something glaringly obvious here?

 - Bram

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