这个问题特别奇特！
发现过程：客户网站从2.3升级到2.4.2 p1版本，发现elasticsearch 正常，但是始终无法得到任何数据，重置并刷新索引也无效。
问题日志：
\"caused_by\":{\"type\":\"illegal_argument_exception\",\"reason\":\"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [image_label] in order to load field data by uninverting the inverted index. Note that this can use significant memory.\"}}},\"status\":400} at /www/wwwroot/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php:632)"} []
因为客户这个站点是从M1升级过来的，一直无任何问题，本次升级到M2.4,PHP版本及其它均有所升级，一一排除问题所在