db.serverStatus().connections output 4.4.15 compare to 4.2.9

Ops and Admin
1

Hi
we upgrade our mongo db server fro, 4.2.9. to 4.4.15 what we notice in out performance test was that connections to db was increased significantly nothing was change in the client configuration

4.2.9 output

rs0:PRIMARY> db.serverStatus().connections
{
        "current" : 162,
        "available" : 838698,
        "totalCreated" : 538,
        "active" : 1
}

4.4.15 output

rs0:PRIMARY> db.serverStatus().connections
{
        "current" : 751,
        "available" : 838109,
        "totalCreated" : 922,
        "active" : 312,
        "exhaustIsMaster" : 310,
        "exhaustHello" : 0,
        "awaitingTopologyChanges" : 310
}

is there a change in the way “current” connections are calculated since in 4.2.9 it’'s not include the isMaster() calls ?

thanks for your response