Comparison of the Elasticsearch cross-cluster replication to the others
Read on ability to community with more than 1 cluster, discover ccr-stats and recovery new API endpoints. Ensure follower is always able to catch up with different types of load and that remote recovery is performing optimally.
Don't forget about compression on the transport layer and index lifecycle management (ILM) together with CCR auto-follow config value.
"One of the highly anticipated features of Elasticsearch 6.7 and 7.0 was (CCR), or the ability to replicate indices across clusters, e.g., for disaster recovery planning or geographically distributed ..."