private Utf8String createToString() {
        return new Utf8String(scheme.toString() + getSchemeParameters() + ':' + namespace + ':' + getSchemeSpecific() + namespaceSpecific);
    }
Creates a IdString based on the given serialized document id string.

The document id string can not contain 0x0 byte characters.
document/src/main/java/com/yahoo/document/idstring/IdString.java