@Override
    public boolean equals(Object obj) {
        if (!(obj instanceof GlobalId)) {
            return false;
        }
        GlobalId rhs = (GlobalId) obj;
        return Arrays.equals(raw, rhs.raw);
    }
Returns the raw byte array that constitutes this global id.
The returned value MUST NOT be modified.
document/src/main/java/com/yahoo/document/GlobalId.java