Cherry-pick #8449 to 6.4: Allow to pass config overrides via the Settings Struct #8815
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Cherry-pick of PR #8449 to 6.4 branch. Original message:
Sometime a custom beat that get executed want to override system
defaults instead of relying on code defined by libbeat.
This is the case with beatless, the queue has limits and flush values
that make sense when the beat is run on the edge but not on on AWS lambda.
Note that settings is passed via liberal common.Config no type checking is
done. I went that route because many parts of beats doesn't expose the
config struct outside of the package.
This is similar to explicitely defining them in the yaml.
Notes: this part of the code is pretty hard to unit test, we have to do some refactoring to make it happen :(