}

    /**
     * Gets the fields that can be used for faceted search.
     *
     * @return array of field names that can be used for faceted search
     */
    public String[] getFacetFields() {
        return facetFields;
    }

    /**
     * Sets the fields that can be used for faceted search.
     * Also updates the facetFieldSet for O(1) lookup performance.
     *

        assertEquals(QueryFieldConfig.INURL_FIELD, queryFieldConfig.getSearchFields()[0]);

        // Verify facet fields are initialized
        assertNotNull(queryFieldConfig.getFacetFields());
        assertTrue(queryFieldConfig.getFacetFields().length > 0);

        // Verify sort fields are initialized
        assertNotNull(queryFieldConfig.getSortFields());
        assertTrue(queryFieldConfig.getSortFields().length > 0);