[Ingest Manager] Logging level defaults to info

[michalpristas]

What does this PR do?

Changes default log level to info

Why is it important?

To save CPU cycles with default configuration. when using default beats are a bit chatty which makes monitoring filebeat resource heavy on CPU

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Fixes: #18351

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[elasticmachine]

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Build stats

• Build Cause: [Pull request [Ingest Manager] Logging level defaults to info #18657 updated]

• Start Time: 2020-05-20T11:47:03.603+0000

• Duration: 70 min 6 sec (4206237)

Test stats 🧪

Test	Results
Failed	0
Passed	3265
Skipped	486
Total	3751

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• Build Cause: [Started by user Michal Pristas, Replayed #4]

• Start Time: 2020-05-21T11:22:46.473+0000

• Duration: 73 min 5 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3265
Skipped	486
Total	3751

[blakerouse]

Looks good.

[ruflin]

Is there a manual way to set it to debug?

@ph I think we need in ingest-manager a way to change this config option

[michalpristas]

it's configurable at start we would need to create some kind of wrapper over logger which will reinstantiate it to enable log level change, as for now loggers we use does not allow on the fly level change.