Since we have been using mysql, and the replication process of mysql database is very common and easy to perform. I am caught in this same issue with elasticsearch, performing CLUSTER REPLICATION, finding the best and appropriate way to do it. Although I have multiple nodes (node recovery), but in case of disaster recover i want a cluster backup in another data center, there by doing cluster replication, but I am not getting help from the elastic community on this.
Can anyone suggest?
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This is a volunteer run forum, so we do our best to answer your questions when we have time away from our own jobs and lives 
Though I'm not sure why you don't think this has been answered, you did ask the same thing in Cluster replication and there are a number of response.