* Deletes all query-based words from the suggest index.
     *
     * @return true if the operation was successful, false otherwise.
     */
    public boolean deleteQueryWords() {
        final SuggestDeleteResponse response = suggester.indexer().deleteQueryWords();
        if (response.hasError()) {
            logger.warn("Failed to delete query words.", response.getErrors().get(0));
            return false;
        }

 * <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.
 * <li>{@link #indexFromQueryLog(QueryLog[])} - Index from multiple query logs.

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

        suggester.indexer().deleteQueryWords();
        suggester.refresh();
        assertEquals(2, suggester.getAllWordsNum());
        assertEquals(2, suggester.getDocumentWordsNum());
        assertEquals(0, suggester.getQueryWordsNum());
    }