Review

class PayloadNearQuery.PayloadNearSpanScorer {
    public Explanation explain(int doc) throws IOException {
      Explanation result = new Explanation();
      Explanation nonPayloadExpl = super.explain(doc);
      result.addDetail(nonPayloadExpl);
      Explanation payloadBoost = new Explanation();
      result.addDetail(payloadBoost);
      float avgPayloadScore = (payloadsSeen > 0 ? (payloadScore / payloadsSeen)
          : 1);
      payloadBoost.setValue(avgPayloadScore);
      payloadBoost.setDescription("scorePayload(...)");
      result.setValue(nonPayloadExpl.getValue() * avgPayloadScore);
      result.setDescription("bnq, product of:");
      return result;
    }

}