code: public ServiceFuture<ElasticPoolInner> updateAsync(String resourceGroupName, String serverName, String elasticPoolName, ElasticPoolUpdate parameters, final ServiceCallback<ElasticPoolInner> serviceCallback) {
          return ServiceFuture.fromResponse(updateWithServiceResponseAsync(resourceGroupName, serverName, elasticPoolName, parameters), serviceCallback);
      }
docs: Updates an existing elastic pool.
  
  @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.
  @param elasticPoolName The name of the elastic pool to be updated.
  @param parameters The required parameters for updating an elastic pool.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object