ns_server has no capabilities for COPY_XATTR_TO_BODY or new sub-document macros.

kv_engine recently introduced some new sub-document macro values as well as a new sub-document operation which enables copying of a value from an xattr into the document body. Unfortunately, there is no way to detect ahead of time whether these features are available which is a requirement to take advantage of them. Marking as a blocker for the moment as it prevents the required utilization of these features for N1QL Transactions.