There are a couple of minor bugs in BoostingTermQuery.explain(). 1. The computation of average payload score produces NaN if no payloads were found. It should probably be: float avgPayloadScore = super.score() * (payloadsSeen > 0 ? (payloadScore / payloadsSeen) : 1);
2. If the average payload score is zero, the value of the explanation is 0: result.setValue(nonPayloadExpl.getValue() * avgPayloadScore); If the query is part of a BooleanClause, this results in: "no match on required clause..." "failure to meet condition(s) of required/prohibited clause(s)" Let me know if I should open a JIRA issue. Peter
