@Override
    public FeatureData features() {
        FeatureData data = (FeatureData)getField("summaryfeatures");
        return data == null ? super.features() : data;
    }
Returns values for the features listed in
<a href="https://docs.vespa.ai/en/reference/schema-reference.html#summary-features">summary-features</a>
in the rank profile specified in the query producing this.
container-search/src/main/java/com/yahoo/prelude/fastsearch/FastHit.java