@SuppressWarnings("RedundantIfStatement")
    @Override
    public boolean equals(Object obj) {
        if (!super.equals(obj)) {
            return false;
        }
        FS4Hit rhs = (FS4Hit)obj;
        if (path != rhs.path) {
            return false;
        }
        if (!globalId.equals(rhs.globalId)) {
            return false;
        }
        if (distributionKey != rhs.distributionKey) {
            return false;
        }
        return true;
    }
Returns the distribution key for the node producing this hit.
searchlib/src/main/java/com/yahoo/searchlib/aggregation/FS4Hit.java