const int maxWaitQueueSize = 5000; // set this to a value that is appropriate
var settings = new MongoClientSettings();

settings.WaitQueueSize = maxWaitQueueSize;

// this is the workaround for the bug.
settings.ClusterConfigurator = cb =>
{
	cb.ConfigureCluster(cs => cs.With(maxServerSelectionWaitQueueSize = maxWaitQueueSize ));
};