Invalid property value doesn't log an error

[n0othing]

• Version: 7.13.2
• Operating System: MacOS 11.4
• Steps to Reproduce:

Came across a scenario where Metricbeat's module config block had an invalid value of enabled for reload.enabled:

# =========================== Modules configuration ============================

metricbeat.config.modules:
  # Glob pattern for configuration loading
  path: ${path.config}/modules.d/*.yml

  # Set to true to enable config reloading
  reload.enabled: enabled

  # Period on which files under path should be checked for changes
  #reload.period: 10s

Metricbeat starts fine with the above, but never loads any modules. There's no warning in the logs to indicate a configuration problem.

[elasticmachine]

Pinging @elastic/agent (Team:Agent)

[botelastic]

Hi!
We just realized that we haven't looked into this issue in a while. We're sorry!

We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1.
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