Lint errors could give hints on indentation problems

For example, with the following config:

output:
  switch:
    retry_until_success: false
    cases:
      - check: errored() && meta().error_count.number() > 100
        processors:
          - log:
              level: DEBUG
              message: 'dropping message due to error_count over threshold.'
        output:
          drop: {}

We give the error field processors not recognised, it'd be much more useful if we could detect the fields of siblings and the parent in order to give a message like field processors not recognised, consider moving it within the field "output".

Use the YAML example and target error as the acceptance reference. No file or test is named, so start by locating the validation path that emits “field processors not recognised” and inspect how parent and sibling fields are available. Done means misplaced fields can produce a useful relocation hint while existing validation remains intact.