core/src/main/java/io/fabric8/maven/core/model/Configuration.java
public Optional<Map<String, Object>> getPluginConfiguration(String system, String id) {
        return pluginConfigLookup.apply(system, id);
    }
public Optional<Map<String, Object>> getPluginConfiguration(String system, String id) {
        return pluginConfigLookup.apply(system, id);
    }
Gets plugin configuration values. Since there can be inner values,
it returns a Map of Objects where an Object can be a
simple type, List or another Map.

@param system the underlying build platform (e.g. "maven")
@param id which plugin configuration to pick
@return configuration map specific to this id