code: public Observable<ClusterInner> beginUpdateAsync(String resourceGroupName, String clusterName, ClusterUpdate parameters) {
          return beginUpdateWithServiceResponseAsync(resourceGroupName, clusterName, parameters).map(new Func1<ServiceResponse<ClusterInner>, ClusterInner>() {
              @Override
              public ClusterInner call(ServiceResponse<ClusterInner> response) {
                  return response.body();
              }
          });
      }
docs: Update a Kusto cluster.
  
  @param resourceGroupName The name of the resource group containing the Kusto cluster.
  @param clusterName The name of the Kusto cluster.
  @param parameters The Kusto cluster parameters supplied to the Update operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ClusterInner object