}

    /**
     * Deletes old words based on a threshold date.
     * @param threshold The threshold date.
     * @return The SuggestDeleteResponse.
     */
    public SuggestDeleteResponse deleteOldWords(final ZonedDateTime threshold) {
        final long start = System.currentTimeMillis();
        final String query = FieldNames.TIMESTAMP + ":[* TO " + threshold.toInstant().toEpochMilli() + "] NOT " + FieldNames.KINDS + ':'

    private final CrawlerContainer crawlerContainer;

    /** MIME type of the content */
    private String mimeType;

    /** Filename of the content */
    private String filename;

    /** Cache file size threshold in bytes */
    private int cacheFileSize = 1_000_000;

    /** Name of the extractor to use */
    private String extractorName = "tikaExtractor";

    /** Maximum content length allowed */

        suggester.indexer().addElevateWord(elevateWord, true);
        suggester.refresh();

        Thread.sleep(1000);
        ZonedDateTime threshold = ZonedDateTime.now();
        Thread.sleep(1000);

        suggester.indexer().indexFromDocument(new Map[] { Collections.singletonMap(field, (Object) "検索エンジン") });
        suggester.refresh();