Update custom log package

[ruflin]

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[ruflin]

@nchaulet I tried to have a fully custom part in this config here. When I try to fill it in with foo: bar in the UI I get the following error:

can not read an implicit mapping pair; a colon is missed at line 7, column 13: "##custom##" ^

If would assume it replaced {{custom}} by foo: bar so it should be valid?

[nchaulet]

This a good scenario that we did not cover, I did the compilation of yaml to be able to support values like custom: {{custom}}

Thinking of the solution we have:

1. We can probably add a new concept in the registry variables, to flag a variable that should be spread to the agent yaml.
2. we can try to detect in the template that custom is a root level yaml value and do another special treatment, I have a POC here [Ingest] Support root level yaml variables in agent stream template kibana#66120

[ruflin]

++ on option 2 as I would prefer to have as few "types" as possible on the package level.

[elasticmachine]

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• Start Time: 2020-05-18T12:18:14.748+0000

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[ph]

LGTM.