2 Cluster Elasticsearch

Can I setup 2 cluster with 1 node and sync data?
My purpose is that, if ever 1 cluster i down, there's a failover on another system.

There is currently nothing that will natively do this. There are changes coming to 6.0 that will eventually allow it though.

For now you need to use methods like these - https://www.elastic.co/blog/clustering_across_multiple_data_centers

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Thank you for your response @warkolm

Can you please help me understand the option 1?

Real-time Availability Across Geographic Regions

Does this means that i will index my data per cluster by using code? and logstash?

Yes that is one option.

It could transfer the index automatically (sync) between the cluster?

Not automatically, no.

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