*
     * @param field the field name to check
     * @return true if the field is allowed in API responses, false otherwise
     */
    public boolean isApiResponseField(final String field) {
        return apiResponseFieldSet.contains(field);
    }

    /**
     * Gets the fields that are included in standard search responses.
     *

        assertTrue(queryFieldConfig.isApiResponseField("field1"));
        assertTrue(queryFieldConfig.isApiResponseField("field2"));
        assertTrue(queryFieldConfig.isApiResponseField("field3"));

        // Test invalid API response fields
        assertFalse(queryFieldConfig.isApiResponseField("invalid"));
        assertFalse(queryFieldConfig.isApiResponseField(""));

                        final String name = entry.getKey();
                        if (StringUtil.isNotBlank(name) && entry.getValue() != null
                                && ComponentUtil.getQueryFieldConfig().isApiResponseField(name)) {
                            if (!first2) {
                                buf.append(',');
                            } else {
                                first2 = false;