@Override
    public void disclose(Discloser discloser) {
        super.disclose(discloser);
        discloser.addProperty("targetNumHits", targetNumHits);
        discloser.addProperty("scoreThreshold", scoreThreshold);
        discloser.addProperty("thresholdBoostFactor", thresholdBoostFactor);
    }
Sets the boost factor used by the backend search operator to boost the threshold before
comparing it with the upper bound score of the document being evaluated.
A large value of this factor results in fewer full evaluations and in an expected loss in precision.
Similarly, a gain in performance might be expected. Default value is 1.0.

NOTE: This boost factor is only used when this WandItem is searching a Vespa field.

@param thresholdBoostFactor the boost factor.
container-search/src/main/java/com/yahoo/prelude/query/WandItem.java