The method public void addAdditionalField(Field field) is not effectively accessible

[ilyavy]

The method public void addAdditionalField(Field field) in class FluencyLogbackAppender is not effectively accessible due to the fact that the public class Field is declared as inner class in package-private abstract class FluentdAppender.

Probably, it's worth to extract Field class to the separate one so that to make it accessible.