public async Task HealthcareAsyncCancellation()
        {
            string endpoint = TestEnvironment.Endpoint;
            string apiKey   = TestEnvironment.ApiKey;

            var client = new TextAnalyticsClient(new Uri(endpoint), new AzureKeyCredential(apiKey));

            #region Snippet:TextAnalyticsSampleHealthcareAsyncCancellation
            string document = @"RECORD #333582770390100 | MH | 85986313 | | 054351 | 2/14/2001 12:00:00 AM | CORONARY ARTERY DISEASE | Signed | DIS | \
                                Admission Date: 5/22/2001 Report Status: Signed Discharge Date: 4/24/2001 ADMISSION DIAGNOSIS: CORONARY ARTERY DISEASE. \
                                HISTORY OF PRESENT ILLNESS: The patient is a 54-year-old gentleman with a history of progressive angina over the past several months. \
                                The patient had a cardiac catheterization in July of this year revealing total occlusion of the RCA and 50% left main disease ,\
                                with a strong family history of coronary artery disease with a brother dying at the age of 52 from a myocardial infarction and \
                                another brother who is status post coronary artery bypass grafting. The patient had a stress echocardiogram done on July , 2001 , \
                                which showed no wall motion abnormalities , but this was a difficult study due to body habitus. The patient went for six minutes with \
                                minimal ST depressions in the anterior lateral leads , thought due to fatigue and wrist pain , his anginal equivalent. Due to the patient's \
                                increased symptoms and family history and history left main disease with total occasional of his RCA was referred for revascularization with open heart surgery.";

            var batchDocument = new List <string>();

            for (var i = 0; i < 10; i++)
            {
                batchDocument.Add(document);
            }

            HealthcareOperation healthOperation = await client.StartHealthcareBatchAsync(batchDocument, "en");

            await client.StartCancelHealthJobAsync(healthOperation);
        }