Upgrade to Node 14.x

[mshustov]

Kibana should use nodejs v14 for v7.last release. According to our policy, we support the v7.last version until v9.0 is released (in ~2-2.5 years from now). Which means we cannot release v7.last with nodejs12 with the end of support on 30.04.2022
The same problem exists for v8.0 that's going to be released less than one year before nodejs v12 end of support.

Not sure which team owns this responsibility considering all the latest changes: @elastic/kibana-operations or @elastic/kibana-platform, considering that's a runtime environment and likely will require some tweaks in the platform & plugin code.

[kobelb]

Historically, we've had the operations team perform node upgrades. However, given their recent focus on the build, CI, and developer tooling, it feels a bit off. I was hoping that the files that had to be changed to upgrade to Node 12 would be revealing, but it looks like small changes were required to a bunch of things. Do the people that have historically done these upgrades have an opinion?

[tylersmalley]

I don't have a preference for which team ultimately owns it. We're currently tracking that as a blocker for 8.0 here: #54039

[spalger]

I personally like the volunteer model we've followed so far. Operations and Platform usually have a decent amount of involvement, though I personally think of it as an operations concern, though it's usually a very cross-team effort for major upgrades.

[mshustov]

closed in favour of #54039