if (facetResponse != null && facetResponse.hasFacetResponse()) {
                // facet field
                if (facetResponse.getFieldList() != null) {
                    facetField = facetResponse.getFieldList().stream().map(field -> {
                        final Map<String, Object> fieldMap = new HashMap<>(2, 1f);
                        fieldMap.put("name", field.getName());