Github user ottobackwards commented on the issue:
https://github.com/apache/metron/pull/675
Right. This PR adds the Language Capability to required variables be
passed based on the VariableResolver implementation defined. Which can be
defined based on the requirements of the 'host' -> so Enrichments and Parsers
use Map, which is forgiving because of the reasons you mention.
Lambdas use their own, which is forgiving, because in a lambda (x) -> DO(x)
you can name 'x' whatever you want.
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