}

            @Override
            public String getIndexFieldFavoriteCount() {
                return "favorite_count";
            }

            @Override
            public String getIndexFieldConfigId() {
                return "config_id";
            }

            @Override
            public String getIndexFieldLang() {
                return "lang";
            }

            @Override

            @Override
            public int getCrawlingThreadCount() {
                return 1; // Reduced from 2 to minimize thread overhead
            }

            @Override
            public String getIndexFieldConfigId() {
                return "config_id";
            }

            @Override
            public String getIndexFieldSegment() {
                return "segment";
            }

            }

            @Override
            public String getIndexFieldFavoriteCount() {
                return "favorite_count";
            }

            @Override
            public String getIndexFieldConfigId() {
                return "config_id";
            }

            @Override
            public String getIndexFieldLang() {
                return "lang";
            }

            @Override

            }

            @Override
            public String getIndexFieldFavoriteCount() {
                return "favorite_count";
            }

            @Override
            public String getIndexFieldConfigId() {
                return "config_id";
            }

            @Override
            public String getIndexFieldLang() {
                return "lang";
            }

            @Override

            }

            @Override
            public String getIndexFieldFavoriteCount() {
                return "favorite_count";
            }

            @Override
            public String getIndexFieldConfigId() {
                return "config_id";
            }

            @Override
            public String getIndexFieldLang() {
                return "lang";
            }

            @Override

            }

            @Override
            public String getIndexFieldFavoriteCount() {
                return "favorite_count";
            }

            @Override
            public String getIndexFieldConfigId() {
                return "config_id";
            }

            @Override
            public String getIndexFieldLang() {
                return "lang";
            }

            @Override

                    fessConfig.getIndexFieldThumbnail(), //
                    fessConfig.getIndexFieldClickCount(), //
                    fessConfig.getIndexFieldFavoriteCount(), //
                    fessConfig.getIndexFieldConfigId(), //
                    fessConfig.getIndexFieldLang(), //
                    fessConfig.getIndexFieldHasCache());
        }
        if (scrollResponseFields == null) {

        try {
            final Map<String, Object> doc = indexingHelper.getDocument(searchEngineClient, id,
                    new String[] { fessConfig.getIndexFieldThumbnail(), fessConfig.getIndexFieldConfigId() });
            if (doc == null) {
                throw new ThumbnailGenerationException("Document is not found: " + id);
            }

        }

        Map<String, Object> doc = null;
        try {
            doc = searchHelper
                    .getDocumentByDocId(form.docId, new String[] { fessConfig.getIndexFieldUrl(), fessConfig.getIndexFieldConfigId() },
                            getUserBean())
                    .orElse(null);
        } catch (final Exception e) {
            logger.warn("Failed to request: {}", form.docId, e);
        }

        assertEquals("click_count", fessConfig.getIndexFieldClickCount());
    }

    @Test
    public void test_indexFieldConfigId() {
        assertEquals("config_id", fessConfig.getIndexFieldConfigId());
    }

    @Test
    public void test_indexFieldExpires() {
        assertEquals("expires", fessConfig.getIndexFieldExpires());
    }

    @Test
    public void test_indexFieldUrl() {