fill in ECS-compat top-level fields from context

[graphaelli]

• agent <- context.service.agent
• host <- context.system
  • host.os.platform <- context.system.platform
• process <- context.process
  • process.args <- context.process.argv, now indexed
• service <- context.service

Also indexes observer.listening, missed previously.

[jalvz]

rebasing master should fix the test

[simitt]

Will moving context.requrest.url.* -> url.* and context.response.* -> http.response.* be handled in an extra PR?

I can take a look at the skipped test (rebasing onto master did not solve it).

[jalvz]

Hmm, i thought it was because of the onboarding document ordering

[simitt]

It is because the metadata are moved out of context, so the test needs to be adapted. I am on it.

[simitt]

@graphaelli I did a force-push because I rebased to master.

[graphaelli]

Thanks for the fixups. All review feedback has been addressed and one test has been skipped, @simitt is already working on that one, thank you.

[graphaelli]

only the sync job failed, as expected.