I have a 6 node cluster where all nodes are master eligible and data nodes
I have 2 degrees of Replication across the cluster
During rolling upgrade from 6.2.4 to 6.8.1 is it ever possible for the cluster to be green in the upgrade process?
if the 1st node is upgraded, and all other nodes are on older versions, the cluster goes to yellow state because during the upgrade process, once shards get allocated to nodes with newer versions, these same shards cannot be reallocated to nodes with lower versions of elastic (normal behavior)
I just want to understand if this means through the rolling upgrade process my cluster will always be yellow until all nodes are upgraded and have same versions , is this correct please ?