private static DocapiCommon.BucketId toProtoBucketId(BucketId id) {
        return DocapiCommon.BucketId.newBuilder().setRawId(id.getRawId()).build();
    }
Implementation of MessageBus message request/response serialization built around Protocol Buffers.
documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/RoutableFactories80.java