public void reinitServer(int index) throws InstantiationException, IOException {
    MockDataNodeId dataNode = clusterMap.getDataNodes().get(index);
    AmbryServer server = initializeServer(dataNode, sslProps, enableHardDeletes, notificationSystem, time, null);
    serverList.set(index, server);
    server.startup();
  }
re-initilize and start up a single server.
@throws InstantiationException
@throws IOException
ambry-test-utils/src/main/java/com/github/ambry/server/MockCluster.java