Hi, This is Jason.
I would like to add remote cluster which is free-tier 6.0 with our platinum-tier 6.8 cluster.
But I have no success to add this remote cluster.
I confirmed firewall is open so I can get remote cluster's health via REST API.
AFAIK, 6.0 and 6.8 is transport compatible.
[reference : https://www.elastic.co/guide/en/elasticsearch/reference/6.8/modules-remote-clusters.html#remote-cluster-settings]
In addition, Can I create a ML-job with indices on remote cluster?
Thanks & regards,