Before an upgrade to 7.x, why is it required to set the below value
discovery.zen.ping.unicast.hosts
?
" After the cluster forms successfully for the first time, remove the cluster.initial_master_nodes
setting from each nodes' configuration. Do not use this setting when restarting a cluster or adding a new node to an existing cluster."
Does this setting needs to be explicitly removed from elasticsearch.yml file after cluster bootstrapping is completed?