+ new_clone->server_failure_limit= source->server_failure_limit;
+ new_clone->io_msg_watermark= source->io_msg_watermark;
+ new_clone->io_bytes_watermark= source->io_bytes_watermark;
+ new_clone->io_key_prefetch= source->io_key_prefetch;
+ new_clone->number_of_replicas= source->number_of_replicas;