try {
            searchEngineClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), queryBuilder);

        } catch (final Exception e) {
            logger.error("Could not delete expired documents: {}", queryBuilder, e);
            resultBuf.append(e.getMessage()).append("\n");
        }

        return resultBuf.toString();
    }

  @Override
  public SampleElements<Entry<String, String>> samples() {
    return new SampleElements<>(
        mapEntry("one", "January"),
        mapEntry("two", "February"),
        mapEntry("three", "March"),
        mapEntry("four", "April"),
        mapEntry("five", "May"));
  }

  @Override
  public Map<String, String> create(Object... entries) {
    @SuppressWarnings("unchecked")

        final String value = getSystemProperty(key);
        if (value != null) {
            try {
                return Integer.parseInt(value);
            } catch (final NumberFormatException e) {
                // ignore
            }
        }
        return defaultValue;
    }

    default void setSystemPropertyAsInt(final String key, final int value) {

        if (StringUtil.isNotBlank(name)) {
            try {
                return requestManager.getParameter(name).filter(StringUtil::isNotBlank).map(LocaleUtils::toLocale);
            } catch (final Exception e) {
                logger.debug("Failed to parse a value of {}.", name, e);
            }
        }
        return OptionalObject.empty();
    }

    @Override

        return index < items.length;
    }

    @Override
    public T next() {
        try {
            final T o = items[index];
            index++;
            return o;
        } catch (final IndexOutOfBoundsException e) {
            throw new NoSuchElementException("index=" + index);
        }
    }

    @Override
    public void remove() {

            for (int i = 0; i < this.b.length; i++) {
                if (this.b[i] != t.b[i]) {
                    return false;
                }
            }
            return true;
        } catch (final Throwable e) {
            return false;
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {

        getUser(form).ifPresent(entity -> {
            try {
                userService.store(entity);
                saveInfo(messages -> messages.addSuccessCrudCreateCrudTable(GLOBAL));
            } catch (final Exception e) {
                logger.warn("Failed to add {}", entity, e);
                throwValidationError(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)),

        ResponseData responseData = new ResponseData();

        try {
            testTransformer.transform(responseData);
            fail("Should throw CrawlerSystemException");
        } catch (CrawlerSystemException e) {
            assertEquals("Test exception", e.getMessage());
        }

        assertEquals(1, testTransformer.getTransformCallCount());
    }

    /**

        final SearchLogHelper searchLogHelper = ComponentUtil.getSearchLogHelper();

        final StringBuilder resultBuf = new StringBuilder();

        try {
            searchLogHelper.storeSearchLog();
        } catch (final Exception e) {
            logger.error("Failed to store a search log.", e);
            resultBuf.append(e.getMessage()).append("\n");
        }

        return resultBuf.toString();
    }

                try {
                    return cache.get(propertyKey,
                            () -> System.getProperty(Constants.FESS_CONFIG_PREFIX + propertyKey, super.get(propertyKey)));
                } catch (final ExecutionException e) {
                    return super.get(propertyKey);
                }
            }
        };
    }