Hello. I would like to connect ES 6.0.0-beta1 node to my ES 5.5.0 cluster. But ES 6.0.0-beta1 node does not detect any masters. Is this correct behaviour? ES 6 should support rolling upgrade from ES 5 so I think this should work ...
It is expected that a 6.0.0-beta1 node cannot join a 5.5.0 cluster. When ES 6 is fully release (GA'd) it should support a rolling upgrade from a 5.latest cluster, where 5.latest is the latest version of 5.x to be release when 6.0.0 is released. While 6.0.0 is in beta it does not support major version rolling upgrades.
Also note that because 6.0.0-beta 1 is a beta release we advise against deploying it in production instances and should instead only be used for testing and development.
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