@Override
    public Object clone()  {
        try {
            Presentation clone = (Presentation)super.clone();
            if (boldingData != null)
                clone.boldingData = new ArrayList<>(boldingData);

            if (highlight != null)
                clone.highlight = highlight.clone();

            if (summaryFields != null) {
                clone.summaryFields = LazySet.newHashSet();
                clone.summaryFields.addAll(this.summaryFields);
            }

            return clone;
        }
        catch (CloneNotSupportedException e) {
            throw new RuntimeException("Someone inserted a noncloneable superclass", e);
        }
    }
Set the desired format for result rendering. If null, use the default renderer.
container-search/src/main/java/com/yahoo/search/query/Presentation.java