Plasma covering array index latency increase for not_bound

90th percentile query latency (ms), Q2 Array Indexing, Covering, Singleton Unique Lookup, 450 queries/sec, Plasma, not_bounded

http://showfast.sc.couchbase.com/#/timeline/Linux/n1ql/array/all

7.1.0-1886 - http://perf.jenkins.couchbase.com/job/iris/26605/console - 8.9

7.1.0-1887 - http://perf.jenkins.couchbase.com/job/iris/26606/console - 35.7

http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=iris_710-1886_access_0dd3&snapshot=iris_710-1887_access_f219

http://changelog.build.couchbase.com/?product=couchbase-server&fromVersion=7.1.0&fromBuild=1886&toVersion=7.1.0&toBuild=1887&f_asterixdb=off&f_indexing=on&f_plasma=on&f_product-metadata=off&f_query-ui=off&f_testrunner=off