Is it necessary to upgrade?

We are running Elasticsearch v2.4 and are still happy with it.
Are there any reasons to upgrade besides new features and performance improvements?
E.g. are there any security issues with the 2.x branch? I could not find anything on this.

There's quite a few security fixes -

But yeah, tonnes and tonnes of features and performance. 2.X has been EOL for a loooooooooong time.

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Thanks for the link!
It seems though that if you just use bare bone Elasticsearch without scripting or other components like Kibana, there seem to be no security issues mentioned.

I guess that's a matter of your own organisational security guidelines and preference.

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