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[dadoonet (David Pilato)]

Agreed with Christian. As we already mentioned in December

Unable to access data from elastic search

Could you explain what the problem is? Hard to tell without seeing any information on that like code. That said, I'm not a dotnet dev so I don't know if I can help but may be someone would be able to. That's a way too old. It's not even the latest stable of the 5.x version. We don't support 5.x anymore. Consider updating to 7.10.

You really need to upgrade your cluster IMO.