ML recipes require updating for recent stack versions

[sophiec20]

These examples require updating for more recent versions of the stack as they are currently 5.x.

@richcollier @grabowskit Interested to hear your thoughts on how many versions we should keep alive. 5.x will differ from 6.3+ which will probably differ from 7.x.

Raised here https://discuss.elastic.co/t/how-to-get-xpack-running-for-detecting-dns-data-exfiltration/202962

[richcollier]

I personally think that the recipes should be removed from the website and instead the "recipes" should be just whatever gets documented as the ML jobs for the SIEM app.

[willemdh]

I personally think there are not enough ML recipe examples and that the existing ones should be updated asap to reflect the latest ECS version. (disclaimer I have a subscription). It requires time and dedication to set up ml jobs in the correct way so they are more or less future proof and integrate with alerting etc. All help in understanding use cases and different ml job configurations are imho more then welcome..