public void produce(RuleEvaluation e) {
        removeNonreferencedMatches(e);
        if (e.getTraceLevel() >= 5) {
            e.trace(5,"Removed terms to get '" + e.getEvaluation().getQuery().getModel().getQueryTree().getRoot() + "', will add terms");
        }
        super.produce(e);
    }
Carries out the production of this rule
container-search/src/main/java/com/yahoo/prelude/semantics/rule/ReplacingProductionRule.java