I’m going to upgrade 2.5.1 to 3.0.2 and was wondering if I can do this in place? I have 18 total nodes, with 1 node being the master and web interface. Can I upgrade the master node and then slowly upgrade all the other nodes? So can I have 2.5.1 and 3.0.2 running at the same time?
Or do I need to migrate the MongoDB to another DB, bring up the new deployment, and then slowly point everything over to it?
All other items have been taken care of via the documentation (Elasticsearch versions, config opt renames, etc).