}

    @Deprecated
    public Deferred<SuggestIndexResponse>.Promise indexFromDocument(final Supplier<DocumentReader> reader, final int docPerReq,
            final long requestInterval) {
        return indexFromDocument(reader, docPerReq, () -> ThreadUtil.sleep(requestInterval));
    }

    public Deferred<SuggestIndexResponse>.Promise indexFromDocument(final Supplier<DocumentReader> reader, final int docPerReq,

        suggester.indexer().indexFromDocument(new Map[] { Collections.singletonMap(field, (Object) "この柿は美味しい。") });
        suggester.indexer().addElevateWord(elevateWord, true);
        suggester.refresh();

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

        final int docPerReq = fessConfig.getSuggestUpdateDocPerRequestAsInteger();
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        suggester.indexer().indexFromDocument(() -> {
            final ESSourceReader reader = new ESSourceReader(ComponentUtil.getSearchEngineClient(), suggester.settings(),
                    fessConfig.getIndexDocumentSearchIndex());