Using Elasticsearch client 6.4 with a 5.6 server?

Hey,
I have a little question regarding the use of a new client (6.4) with an older server (5.6).
Due to some technical limitations, I'm not able to upgrade the server right now,
However - I am able to upgrade the client, the question is whether or not there's going to be an issue with that?

Thanks in advance!

It might not work correctly.

Which client are you talking about BTW?

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