A new defect has been detected and assigned to hari.khalsa@10gen.com in Coverity Connect http://coverity.mongodb.com//sourcebrowser.htm?projectId=10001#mergedDefectId=15610
The defect was flagged by checker RESOURCE_LEAK in
file /src/mongo/db/query/multi_plan_runner.cpp
function mongo::MultiPlanRunner::getExplainPlan(mongo::TypeExplain **) const
and this ticket was created by matt.kangas@10gen.com

https://github.com/mongodb/mongo/blame/master/src/mongo/db/query/multi_plan_runner.cpp#L472-L477

            TypeExplain* candidateExplain;
            status = explainPlan(**it, &candidateExplain, false /* no full details */);
            if (status != Status::OK()) {
                continue;
            }

12. alloc_arg: "mongo::explainPlan(mongo::PlanStageStats const &, mongo::TypeExplain **, bool)" allocates memory that is stored into "candidateExplain".
CID 15610 (#1 of 1): Resource leak (RESOURCE_LEAK)15. leaked_storage: Variable "candidateExplain" going out of scope leaks the storage it points to.