@VisibleForTesting
    ExecutionConfig getExecutionConfig(String taskQueue) {
        if (!QueueUtils.isIsolatedQueue(taskQueue)) {
            return this.defaultExecutionConfig;
        }
        return queueExecutionConfigMap.computeIfAbsent(
                taskQueue, __ -> this.createExecutionConfig());
    }
The worker that polls and executes an async system task.
core/src/main/java/com/netflix/conductor/core/execution/tasks/SystemTaskWorker.java