I created a 3-node cluster on Azure using Elastic's template. All three nodes are master eligible, and Marvel shows there are three nodes in the cluster, which is expected.
I then resized one of the three VM from DS1 to DS2, essentially from a 1 Core 3.5G VM to a 2 Core 7G VM. After resizing, I am surprised to find that there are four nodes in the cluster now as reported by Marvel. Two of the nodes have the same host name and are running on the same VM that's resized.
Is this expected behavior? If it is expected, is this because Elasticsearch works better with a lot of smaller nodes with limited memory and processing power?