docs/data/reusables/enterprise_clustering/replacing-a-cluster-node-replacement-name.md

1. If you're replacing the primary MySQL or Redis node, in cluster.conf, modify the mysql-master or redis-master value with the replacement node name.

For example, this modified cluster.conf file specifies a newly provisioned cluster node, ghe-replacement-data-node-1 as the primary MySQL and Redis node:

  mysql-master = ghe-replacement-data-node-1
  redis-master = ghe-replacement-data-node-1