Hi I read in few emails/issue comments that rolling upgrades from 5.x to 6.0 isn't supported. Is it really the case? Does it mean that anyone who has a 5.x Solr cluster *must* incur down time when upgrading to 6.0?
If this is really the case, can someone list the known issues/reasons for that?Can we do something about it, e.g. in a subsequent 5.6 release that will allow rolling upgrades (like the 5.4.1 fix that allowed rolling upgrades from pre-5.4 to 5.4)? I feel it's odd (and may not be taken well) if we force users to take down their entire cluster if they want to upgrade to 6.0. Definitely feels like it will also slow down 6.0 adoption. And if nothing can be done, what's the recommended way then to upgrade to 6.0? Shai
