[Reporting/CSV] Do not fail the job if scroll ID can not be cleared (#…

…76014)

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/plugins/reporting/server/export_types/csv/generate_csv/hit_iterator.test.ts

@@ -7,17 +7,13 @@
 import expect from '@kbn/expect';
 import sinon from 'sinon';
 import { CancellationToken } from '../../../../common';
-import { LevelLogger } from '../../../lib';
+import { createMockLevelLogger } from '../../../test_helpers/create_mock_levellogger';
 import { ScrollConfig } from '../../../types';
 import { createHitIterator } from './hit_iterator';
 
-const mockLogger = {
-  error: new Function(),
-  debug: new Function(),
-  warning: new Function(),
-} as LevelLogger;
+const mockLogger = createMockLevelLogger();
 const debugLogStub = sinon.stub(mockLogger, 'debug');
-const warnLogStub = sinon.stub(mockLogger, 'warning');
+const warnLogStub = sinon.stub(mockLogger, 'warn');
 const errorLogStub = sinon.stub(mockLogger, 'error');
 const mockCallEndpoint = sinon.stub();
 const mockSearchRequest = {};
@@ -134,4 +130,30 @@ describe('hitIterator', function () {
     expect(errorLogStub.callCount).to.be(1);
     expect(errorThrown).to.be(true);
   });
+
+  it('handles scroll id could not be cleared', async () => {
+    // Setup
+    mockCallEndpoint.withArgs('clearScroll').rejects({ status: 404 });
+
+    // Begin
+    const hitIterator = createHitIterator(mockLogger);
+    const iterator = hitIterator(
+      mockConfig,
+      mockCallEndpoint,
+      mockSearchRequest,
+      realCancellationToken
+    );
+
+    while (true) {
+      const { done: iterationDone, value: hit } = await iterator.next();
+      if (iterationDone) {
+        break;
+      }
+      expect(hit).to.be('you found me');
+    }
+
+    expect(mockCallEndpoint.callCount).to.be(13);
+    expect(warnLogStub.callCount).to.be(1);
+    expect(errorLogStub.callCount).to.be(1);
+  });
 });

x-pack/plugins/reporting/server/export_types/csv/generate_csv/hit_iterator.ts

@@ -68,11 +68,17 @@ export function createHitIterator(logger: LevelLogger) {
       );
     }
 
-    function clearScroll(scrollId: string | undefined) {
+    async function clearScroll(scrollId: string | undefined) {
       logger.debug('executing clearScroll request');
-      return callEndpoint('clearScroll', {
-        scrollId: [scrollId],
-      });
+      try {
+        await callEndpoint('clearScroll', {
+          scrollId: [scrollId],
+        });
+      } catch (err) {
+        // Do not throw the error, as the job can still be completed successfully
+        logger.warn('Scroll context can not be cleared!');
+        logger.error(err);
+      }
     }
 
     try {
@@ -86,7 +92,7 @@ export function createHitIterator(logger: LevelLogger) {
           ({ scrollId, hits } = await scroll(scrollId));
 
           if (cancellationToken.isCancelled()) {
-            logger.warning(
+            logger.warn(
               'Any remaining scrolling searches have been cancelled by the cancellation token.'
             );
           }