Follow up with a similar question.
I'm running 7.15 today (both ES & REST client). Is there a document suggesting how to upgrade to say ES 8.5?
We don't do instance upgrade. We use double write.
We will have both 7.15 & 8.5 clusters running during the transition where the applications will double write to both clusters.
Once the new cluster (8.5) is loaded with enough data, we then switch the reader from old 7.15 to new 8.5 cluster. Then stop the double write from applications and thenshutdown the old 7.15 cluster.
Our applications consist of both java and python.
With such operation, what is the proper way to migrate our code from REST to API?
Any pointers will be highly appreciated.
Thanks.