*   <li>While waiting for new URLs to be added to the queue ({@link #delayForWaitingNewUrl()})</li>
 * </ul>
 *
 * <p>
 * Subclasses are responsible for implementing the abstract methods to define the actual delay
 * mechanism for each of these stages.
 * </p>
 *
 * <p>
 * The class also provides a mechanism to ignore exceptions that may occur during the delay process.

            }
        } finally {
            SuggestUtil.deleteScrollContext(client, scrollId);
        }
        return mappingMap;
    }

    /**
     * Check analyzers.
     * @return Undefined analyzer set
     */
    public Set<String> checkAnalyzer() {
        final String text = "text";
        final Set<String> undefinedAnalyzerSet = new HashSet<>();
        for (final String lang : SUPPORTED_LANGUAGES) {