[system test]GSI Drop() - cause: Request Timeout

cbq> drop index default.flight_num_route;
{
"requestID": "48a1777d-ca9b-433a-9312-40dbd1021949",
"signature": null,
"results": [
],
"errors": [

{ "code": 5000, "msg": "GSI Drop() - cause: Request Timeout" }

],
"status": "errors",
"metrics":

{ "elapsedTime": "2m0.170371965s", "executionTime": "2m0.170255374s", "resultCount": 0, "resultSize": 0, "errorCount": 1 }

}

I see the above error when I try to drop any index on the cluster.

Adding logs.
Seeing it intermittently - hence marked currently as Critical.