// ============================================================

    @Test
    public void test_indexFromQueryLogReaderWithEmptyReader() throws Exception {
        QueryLogReader emptyReader = new QueryLogReader() {
            @Override
            public QueryLog read() {
                return null; // Empty reader
            }

            @Override
            public void close() {

     * @param queryLogReader The query log reader
     * @param docPerReq The number of documents to process per request
     * @param requestInterval The interval between requests
     * @return A Promise that will be resolved with the SuggestIndexResponse
     */
    public Deferred<SuggestIndexResponse>.Promise indexFromQueryLog(final ContentIndexingContext ctx, final QueryLogReader queryLogReader,

     * @param queryLogReader The query log reader.
     * @param docPerReq The number of documents to process per request.
     * @param requestInterval The interval between requests.
     * @return A Promise that will be resolved with the SuggestIndexResponse or rejected with an error.
     */
    public Deferred<SuggestIndexResponse>.Promise indexFromQueryLog(final QueryLogReader queryLogReader, final int docPerReq,

        SuggestSettings settings = suggester.settings();
        String field = settings.array().get(SuggestSettings.DefaultKeys.SUPPORTED_FIELDS)[0];

        final QueryLogReader reader = new QueryLogReader() {
            AtomicInteger count = new AtomicInteger();
            String[] queryLogs = new String[] { field + ":検索", field + ":fess", field + ":検索エンジン" };

            @Override