(systemHelper.getCurrentTimeAsLong() - execTime2));
            }
        }
        finishedSessionIdList.clear();

        if (logger.isInfoEnabled()) {
            logger.info("Deleted completed document data. The execution time is {}ms.", (systemHelper.getCurrentTimeAsLong() - execTime));
        }
    }

    private void forceStop() {
        systemHelper.setForceStop(true);