@Override
    public void visitMembers(ObjectVisitor visitor) {
        super.visitMembers(visitor);
        visitor.visit("path", path);
        visitor.visit("globalId", globalId.toString());
        visitor.visit("distributionKey", distributionKey);
    }
Returns the distribution key for the node producing this hit.
searchlib/src/main/java/com/yahoo/searchlib/aggregation/FS4Hit.java