}
                }
            } catch (final IOException e) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to read data.", e);
                }
                return StringUtil.EMPTY;
            }

            return buf.toString().trim();
        }

        private boolean isSpaceChar(final int c) {

                logger.debug("{} occurs.", e.getClass().getName(), e);
                throw e;
            } catch (final Exception e) {
                if (retryCount > maxRetryCount) {
                    throw e;
                }
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to invoke actionGet. count:{}", retryCount, e);
                }

            return new SuggestIndexResponse(items.length, documents.length, response.getErrors(), indexTime - start);
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to index from document", e);
            }
            throw new SuggestIndexException("Failed to index from document", e);
        }
    }

        }
        try {
            return URLDecoder.decode(name, enc);
        } catch (final UnsupportedEncodingException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to decode URL: " + name + " with encoding: " + enc, e);
            }
            return name;
        }
    }

    /**
     * Returns the charset name.
     * @return the charsetName
     */

                    @Override
                    public XPathAPI load(final String key) {
                        if (logger.isDebugEnabled()) {
                            logger.debug("created XPathAPI by {}", key);
                        }
                        return new XPathAPI();
                    }
                });
    }

    /**

            });
            if (indexResponse.isAcknowledged()) {
                logger.info("Created {} index.", index);
            } else if (logger.isDebugEnabled()) {
                logger.debug("Failed to create {} index.", index);
            }
        }

        final GetMappingsResponse getMappingsResponse = fesenClient.get(c -> c.admin().indices().prepareGetMappings(index).execute());

            if (creator != null) {
                creator.register(this);
            }
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("CrawlerClientCreator is unavailable.", e);
            }
        }
    }

    /**
     * Adds a client with a regular expression pattern.
     * @param regex The regular expression to match URLs.

     * @param key The key of the setting.
     * @param value The value to set.
     */
    public void set(final String key, final Object value) {
        if (logger.isDebugEnabled()) {
            logger.debug("Set suggest settings. {} key: {} value: {}", settingsIndexName, key, value);
        }
        try {
            client.prepareUpdate()
                    .setIndex(settingsIndexName)

                } catch (final MaxLengthExceededException e) {
                    throw e;
                } catch (final Exception e) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("Failed to access to {}", request.getUrl(), e);
                    }

                    if (listener != null) {
                        listener.onException(this, request, count, e);
                    }

                    if (line == null) {
                        break;
                    }
                    if (logger.isDebugEnabled()) {
                        logger.debug(line);
                    }
                    list.add(line);
                    if (list.size() > maxLineBuffer) {
                        list.remove(0);
                    }