}

            @Override
            public String getIndexFieldLabel() {
                return "label";
            }

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

            @Override
            public String getIndexFieldExpires() {
                return "expires";
            }

            public String getIndexFieldLabel() {
                return baseConfig.getIndexFieldLabel();
            }

            @Override
            public String getIndexFieldSegment() {
                return baseConfig.getIndexFieldSegment();
            }

            @Override
            public String[] getQueryAdditionalResponseFields(String... fields) {

            }

            @Override
            public String getIndexFieldLabel() {
                return "label";
            }

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

            @Override
            public String get(String key) {
                // Return empty string instead of null
                return "";

            }

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

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

            @Override
            public String getIndexFieldExpires() {
                return "expires";
            }

            }

            @Override
            public String getIndexFieldLabel() {
                return "label";
            }

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

            @Override
            public String getIndexFieldAnchor() {
                return "anchor";
            }

            }

            @Override
            public String getIndexFieldLabel() {
                return "label";
            }

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

            @Override
            public String getIndexFieldAnchor() {
                return "anchor";
            }

            queryRequestBuilder.setQuery(QueryBuilders.matchAllQuery());
            final TermsAggregationBuilder termsBuilder = AggregationBuilders.terms(fessConfig.getIndexFieldSegment())
                    .field(fessConfig.getIndexFieldSegment())
                    .size(maxSessionIdsInList)
                    .order(BucketOrder.key(false));
            queryRequestBuilder.addAggregation(termsBuilder);

                    fessConfig.getIndexFieldFiletype(), //
                    fessConfig.getIndexFieldFilename(), //
                    fessConfig.getIndexFieldLabel(), //
                    fessConfig.getIndexFieldSegment(), //
                    fessConfig.getIndexFieldAnchor(), //
                    fessConfig.getIndexFieldClickCount(), //
                    fessConfig.getIndexFieldFavoriteCount(), //

        //  expires
        if (documentExpires != null) {
            defaultDataMap.put(fessConfig.getIndexFieldExpires(), documentExpires);
        }
        // segment
        defaultDataMap.put(fessConfig.getIndexFieldSegment(), initParamMap.getAsString(Constants.SESSION_ID));
        // created
        defaultDataMap.put(fessConfig.getIndexFieldCreated(), systemHelper.getCurrentTime());
        // boost

        assertEquals("anchor", fessConfig.getIndexFieldAnchor());
    }

    @Test
    public void test_indexFieldSegment() {
        assertEquals("segment", fessConfig.getIndexFieldSegment());
    }

    @Test
    public void test_indexFieldRole() {
        assertEquals("role", fessConfig.getIndexFieldRole());
    }

    @Test
    public void test_indexFieldBoost() {