Do client and server need to be upgraded simultaneously?

Elastic Stack Elasticsearch
1

I have a 0.90.11 cluster. I tried upgrading my Java client to 1.0.0 before
upgrading the server, but the 1.0.0 client seems unable to form a
connection with the 0.90.11 cluster. Do the client and server both need to
be running the same version? I was hoping to upgrade one and then the other
for an easier upgrade path.

Thanks,
Ben

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2

Yes if you are using the native Java client.

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