Merge pull request #2954 from gardusig/ack-task-poll-batch

Add an ack request for each task polled from queue, when polling in batches

core/src/main/java/com/netflix/conductor/service/ExecutionService.java

@@ -197,6 +197,7 @@ public List<Task> poll(
         }
         executionDAOFacade.updateTaskLastPoll(taskType, domain, workerId);
         Monitors.recordTaskPoll(queueName);
+        tasks.stream().forEach(task -> ackTaskReceived(task));
         return tasks;
     }