I think there are at least two bugs here: 1. idf should not be squared.
I discussed this in a separate message. It's not a bug.
2. explain() should explain the actual reported score().
This is mostly a documentation bug in Hits. The normalization of scores to 1.0 is performed only by Hits. Hits is a high-level wrapper on the lower-level HitCollector-based search implementations, which do not perform this normalization. We should probably document that Hits scores are so normalized. Also, we could add a method to disable this normalization in Hits. The normalization was added long ago because many folks found it disconcerting when scores were greater than 1.0.
We should not attempt to normalize scores reported by explain(). The intended use of explain() is to compare its output against other calls to explain(), in order to understand how one document scores higher than another. Scores don't make much sense in isolation, and neither do explanations.
Doug
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