public class LdapManager {
    private static final Logger logger = LogManager.getLogger(LdapManager.class);

    protected ThreadLocal<DirContextHolder> contextLocal = new ThreadLocal<>();

    protected volatile boolean isBind = false;

    protected FessConfig fessConfig;

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initialize {}", this.getClass().getSimpleName());

            if (indexResponse.isAcknowledged()) {
                logger.info("Created {} index.", indexName);
                return true;
            }
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to create {} index.", indexName);
            }
        } catch (final Exception e) {
            logger.warn("{} is not found.", indexConfigFile, e);
        }

        return false;

            }, OptionalThing.empty());
            response.flushBuffer();
            if (logger.isDebugEnabled()) {
                logger.debug("Loaded {} docs", count);
            }
        } catch (final InvalidQueryException | ResultOffsetExceededException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to process a scroll request.", e);
            }