code: public DataMigrationServiceInner update(String groupName, String serviceName, DataMigrationServiceInner parameters) {
          return updateWithServiceResponseAsync(groupName, serviceName, parameters).toBlocking().last().body();
      }
docs: Create or update DMS Service Instance.
  The services resource is the top-level resource that represents the Data Migration Service. The PATCH method updates an existing service. This method can change the kind, SKU, and network of the service, but if tasks are currently running (i.e. the service is busy), this will fail with 400 Bad Request ("ServiceIsBusy").
  
  @param groupName Name of the resource group
  @param serviceName Name of the service
  @param parameters Information about the service
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ApiErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the DataMigrationServiceInner object if successful.