assertTrue(queryFieldConfig.isFacetField("category"));
        assertTrue(queryFieldConfig.isFacetField("type"));
        assertTrue(queryFieldConfig.isFacetField("author"));
        assertTrue(queryFieldConfig.isFacetField("date"));

        // Test invalid facet fields
        assertFalse(queryFieldConfig.isFacetField("invalid"));
        assertFalse(queryFieldConfig.isFacetField(""));

            stream(facetInfo.field).of(stream -> stream.forEach(f -> {
                if (!queryFieldConfig.isFacetField(f)) {
                    throw new SearchQueryException("Invalid facet field: " + f);
                }
                final String encodedField = BaseEncoding.base64().encode(f.getBytes(StandardCharsets.UTF_8));