try {
            final SearchResult searchResult = searcher.search(query, params, userBean);
            return createResponseList(searchResult.getDocumentList(), searchResult.getAllRecordCount(),
                    searchResult.getAllRecordCountRelation(), searchResult.getQueryTime(), searchResult.isPartialResults(),
                    searchResult.getFacetResponse(), params.getStartPosition(), pageSize, 0);

        @Override
        protected SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean) {
            throw exception;
        }
    }

    /**
     * Searcher that returns documents without ID field.
     */
    static class NoIdFieldSearcher extends RankFusionSearcher {
        @Override

        }

        @Override
        protected SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean) {
            int start = params.getStartPosition();
            int size = params.getPageSize();
            SearchResultBuilder builder = SearchResult.create();
            for (int i = start; i < start + size && i < allRecordCount; i++) {

        return processResponse(searchResponseOpt);
    }

    /**
     * Processes the OpenSearch response and converts it to a SearchResult.
     *
     * @param searchResponseOpt the optional search response from OpenSearch
     * @return the processed search result
     */
    protected SearchResult processResponse(final OptionalEntity<SearchResponse> searchResponseOpt) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        }

        @Override
        protected SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean) {
            int start = params.getStartPosition();
            int size = params.getPageSize();
            SearchResultBuilder builder = SearchResult.create();
            for (int i = start; i < start + size && i < allRecordCount; i++) {

        }

        @Override
        protected SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean) {
            int start = params.getStartPosition();
            int size = params.getPageSize();
            SearchResultBuilder builder = SearchResult.create();
            for (int i = start; i < start + size && i < allRecordCount; i++) {

		searchRequest := ldap.NewSearchRequest(
			dn,
			ldap.ScopeBaseObject, ldap.NeverDerefAliases, 0, 0, false,
			filter,
			[]string{}, // only need DN, so pass no attributes here
			nil,
		)

		searchResult, err := conn.Search(searchRequest)
		if err != nil {
			// Object does not exist error?
			if ldap.IsErrorWithCode(err, 32) {
				ndn, err := ldap.ParseDN(dn)
				if err != nil {
					return nil, err
				}