Transaction throughput drop by 99% for collections

Avg Throughput (trans/sec), Workload T, 4 nodes, Durability None, 48 vCPU, s=1 c=1

http://showfast.sc.couchbase.com/#/timeline/Linux/kv/transaction/Throughput

7.1.0-2021 - http://perf.jenkins.couchbase.com/job/hercules-txn/3400/ - 43,554

7.1.0-2123 - http://perf.jenkins.couchbase.com/job/hercules-txn/3488/ - 24

http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=hercules_710-2021_access_88cd&snapshot=hercules_710-2123_access_8734