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