private Optional<ErrorMessage> validate(Query query, IndexFacts.Session indexFacts) {
        FuzzyVisitor visitor = new FuzzyVisitor(indexFacts);
        ToolBox.visit(visitor, query.getModel().getQueryTree().getRoot());
        return visitor.errorMessage;
    }
Validates any FuzzyItem query items.

@author alexeyche
container-search/src/main/java/com/yahoo/search/searchers/ValidateFuzzySearcher.java