Node failover time of mongodb is very high

Hi Team, I am new to the openebs and mongodb. I am trying to test the node failure of mongodb statefulset application on openebs. I have 3 node setup in GKE, each mongodb pod runs on a separate node. I killed the node which hosts primary mongodb pod and checked for secondary mongodb pod running on another node to become primary mongodb pod. I got more than 100 seconds as the outage(secondary becoming primary).
So, I have few questions:

  1. Is it really 100 seconds node fail over time of mongodb on openebs?
  2. Should we fine tune any parameters to reduce the node failure time.

Early help should be deeply appreciated.