public HitField buildHitField(String key, boolean forceNoPreTokenize) {
        Object o = getField(key);
        if (o == null) return null;
        if (o instanceof HitField) return (HitField)o;

        HitField h;
        if (forceNoPreTokenize)
            h = new HitField(key, o.toString(), false);
        else
            h = new HitField(key, o.toString());
        h.setOriginal(o);
        getFieldMap().put(key, h);
        return h;
    }
Returns whether any fields are set in this
container-search/src/main/java/com/yahoo/search/result/Hit.java