code: public Observable<Object> deleteAsync(String resourceGroupName, String resourceName, String annotationId) {
          return deleteWithServiceResponseAsync(resourceGroupName, resourceName, annotationId).map(new Func1<ServiceResponse<Object>, Object>() {
              @Override
              public Object call(ServiceResponse<Object> response) {
                  return response.body();
              }
          });
      }
docs: Delete an Annotation of an Application Insights component.
  
  @param resourceGroupName The name of the resource group.
  @param resourceName The name of the Application Insights component resource.
  @param annotationId The unique annotation ID. This is unique within a Application Insights component.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Object object