final String[] fields) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final QueryBuilder queryBuilder = QueryBuilders.prefixQuery(fessConfig.getIndexFieldId(), id);
        return getDocumentListByQuery(searchEngineClient, queryBuilder, fields);
    }

    /**
     * Deletes all child documents that belong to the specified parent document.

                final IndexingHelper indexingHelper = ComponentUtil.getIndexingHelper();
                final long count = indexingHelper.deleteDocumentByQuery(searchEngineClient,
                        QueryBuilders.prefixQuery(fessConfig.getIndexFieldUrl(), url));
                if (logger.isDebugEnabled()) {
                    logger.debug("Deleted {} docs for {}*", count, url);
                }
            } else {