Need help understanding what gradle logs are telling me

We have a complex project that builds jars, wars and packaging them into rpms. Some jars that I was expecting to be included in the war are not included there and I’ve been looking at the --debug output of gradle to try to understand why. Unfortunately the gradle logging is a bit cryptic at times.

Can someone tell me please, what does this mean:

07:57:11.581 [DEBUG] [org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.DependencyGraphBuilder] dependency: org.apache.logging.log4j:log4j-api:2.8 from-conf: compile to-conf: null is filtered.

In particular, what does null is filtered signify?

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