code: public Observable<ImportExportResponseInner> createImportOperationAsync(String resourceGroupName, String serverName, String databaseName, ImportExtensionRequest parameters) {
          return createImportOperationWithServiceResponseAsync(resourceGroupName, serverName, databaseName, parameters).map(new Func1<ServiceResponse<ImportExportResponseInner>, ImportExportResponseInner>() {
              @Override
              public ImportExportResponseInner call(ServiceResponse<ImportExportResponseInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates an import operation that imports a bacpac into an existing database. The existing database must be empty.
  
  @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 databaseName The name of the database to import into
  @param parameters The required parameters for importing a Bacpac into a database.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request