The title basically. We have indices created on ES2 that were upgraded in-place by ES5 when we bumped the version. Would these be able to be read and upgraded by ES6 or will we need to reindex?
You will have to reindex. I just did it while testing 6.0.0-alpha1.
In 5.4, I used the _reindex API to reindex my old .kibana index then I was able to start 6.0.
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