code: public ServiceFuture<FailoverGroupInner> beginUpdateAsync(String resourceGroupName, String serverName, String failoverGroupName, FailoverGroupUpdate parameters, final ServiceCallback<FailoverGroupInner> serviceCallback) {
          return ServiceFuture.fromResponse(beginUpdateWithServiceResponseAsync(resourceGroupName, serverName, failoverGroupName, parameters), serviceCallback);
      }
docs: Updates a failover group.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server containing the failover group.
  @param failoverGroupName The name of the failover group.
  @param parameters The failover group parameters.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object