public void insert(UrlQueue<?> urlQueue) {
            }

            @Override
            public void delete(String sessionId) {
            }

            @Override
            public void deleteAll() {
            }

            @Override
            public void offerAll(String sessionId, List<UrlQueue<?>> newUrlQueueList) {
            }

            @Override

 *   <li>{@code add(ElevateWord elevateWord)} - Adds a new elevate word to the settings.</li>
 *   <li>{@code delete(String elevateWord)} - Deletes an elevate word from the settings.</li>
 *   <li>{@code deleteAll()} - Deletes all elevate words from the settings.</li>
 * </ul>
 *
 * <p>Protected Constructor:</p>
 * <ul>

     *
     * @return true if the operation was successful, false otherwise.
     */
    public boolean deleteAllWords() {
        final SuggestDeleteResponse response = suggester.indexer().deleteAll();
        if (response.hasError()) {
            logger.warn("Failed to delete all words.", response.getErrors().get(0));
            return false;
        }
        refresh();
        return true;
    }

        dataHelper.deleteAccessResultMap(sessionId);
    }

    /**
     * Deletes all access results from all sessions.
     */
    @Override
    public void deleteAll() {
        dataHelper.clearUrlQueueList();
    }

    /**
     * Gets an access result for the specified session and URL.
     *
     * @param sessionId the session ID
     * @param url the URL

 * <li>{@link #deleteByQuery(String)} - Delete suggest items by query string.
 * <li>{@link #deleteByQuery(QueryBuilder)} - Delete suggest items by query builder.
 * <li>{@link #deleteAll()} - Delete all suggest items.
 * <li>{@link #deleteDocumentWords()} - Delete document words.
 * <li>{@link #deleteQueryWords()} - Delete query words.
 * <li>{@link #indexFromQueryLog(QueryLog)} - Index from a single query log.

        }

        suggester.indexer().index(items);
        suggester.refresh();

        assertEquals(3, suggester.getAllWordsNum());

        SuggestDeleteResponse deleteResponse = suggester.indexer().deleteAll();

        assertNotNull(deleteResponse);
        assertFalse(deleteResponse.hasError());

        suggester.refresh();
        assertEquals(0, suggester.getAllWordsNum());
    }

    @Test

        assertEquals(2, suggester.getAllWordsNum());
        assertEquals(2, suggester.getDocumentWordsNum());
        assertEquals(1, suggester.getQueryWordsNum());

        suggester.indexer().deleteAll();
        suggester.refresh();
        assertEquals(0, suggester.getAllWordsNum());
        assertEquals(0, suggester.getDocumentWordsNum());
        assertEquals(0, suggester.getQueryWordsNum());
    }