What would be the best method to copy data from elasticsearch 2.4 to 6.4?

We have an application that uses elasticsearch 2.4 and I would like to be able to ship that to our elasticsearch 6.4 to be able to visualize it with our Kibana. What would be the best method to do that?

I'd probably use reindex from remote feature.

those indices would still be getting updated is there a way to set that to run on an hourly/daily basis?

Sorry I can just script it to run the curl command I guess.

Well. If you have a way to query the changes that could be doable.
Otherwise you will have to reindex the whole everytime.

But you'd better update your application to directly write in the new cluster.

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