Description
The GET /pools/default/.../docs endpoints manually catch any errors from the underlying memcached calls (https://src.couchbase.org/source/xref/trunk/ns_server/apps/ns_server/src/ns_memcached.erl?r=63af4832#1799). This means that nothing is logged when we get a error thrown in this function.
However, we do at least include the error in the response to the request (https://src.couchbase.org/source/xref/trunk/ns_server/apps/ns_server/src/menelaus_web_crud.erl?r=bf5d4781#158-165).
We should probably log these server errors in the debug log.