I've got a 48-node ES cluster running 0.20.5 that I'd like to upgrade to
0.90.3 with as little downtime as possible. I realise that this is a
tall order, as the release notes (and past experience) make it clear
that mixing versions is a Bad Idea, thus I can't simply roll through the
nodes one by one.
Any hints ?
mozilla webops; european outpost.
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