code: public Observable<ServiceResponse<DatabaseAccountInner>> patchWithServiceResponseAsync(String resourceGroupName, String accountName, DatabaseAccountPatchParameters updateParameters) {
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (accountName == null) {
              throw new IllegalArgumentException("Parameter accountName is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          if (updateParameters == null) {
              throw new IllegalArgumentException("Parameter updateParameters is required and cannot be null.");
          }
          Validator.validate(updateParameters);
          Observable<Response<ResponseBody>> observable = service.patch(this.client.subscriptionId(), resourceGroupName, accountName, this.client.apiVersion(), updateParameters, this.client.acceptLanguage(), this.client.userAgent());
          return client.getAzureClient().getPutOrPatchResultAsync(observable, new TypeToken<DatabaseAccountInner>() { }.getType());
      }
docs: Patches the properties of an existing Azure Cosmos DB database account.
  
  @param resourceGroupName Name of an Azure resource group.
  @param accountName Cosmos DB database account name.
  @param updateParameters The tags parameter to patch for the current database account.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request