完整错误日志：
main.CRITICAL: Elasticsearch\Common\Exceptions\BadRequest400Exception: {"error":{"root_cause":[{"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 [samples_title] in order to load field data by uninverting the inverted index. Note that this can use significant memory."}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":[{"shard":0,"index":"moem_product_8_v4","node":"TWVRx3moTheJeTIBQ0d5tg","reason":{"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 [samples_title] in order to load field data by uninverting the inverted index. Note that this can use significant memory."}}],"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 [samples_title] in order to load field data by uninverting the inverted index. Note that this can use significant memory.","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 [samples_title] in order to load field data by uninverting the inverted index. Note that this can use significant memory."}}},"status":400} in /www/wwwroot/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php:693
这种情况的来源
https://support.magento.com/hc/en-us/articles/360027356612-Elasticsearch-5-is-configured-but-search-page-does-not-load- with-Fielddata-is-disabled-error
默认情况下，分层导航中只能使用某些类型的产品属性。它们是 Yes/No、Dropdown、Multipleselect 和 Price。这就是为什么在 Magento 后台时，您不能将任何其他类型的属性设置为在分层导航中使用 及可过滤或在搜索结果分层导航中使用 。但是通过直接更改数据库中的 is_filterable 和 is_filterable_in_search 值，有一种技术上的可能性可以绕过这个限制。而老版本MAGENTO1及MAGENTO2.3部分属性是可以这样子设置的，这就导致了在升级或是更新后，无法以正常在新版本，比如2.4.3/2.4.4等等中正常可用
进入数据库管理。运行
select * from catalog_eav_attribute WHERE is_filterable_in_search = 1 and attribute_id IN (SELECT attribute_id FROM eav_attribute WHERE entity_type_id = 4 AND backend_type = 'varchar')
查询出有哪些属性值是设定的，这里的 `attribute_code` 要记下。
比如
image_label
smallimage_label
label_title
sample_title
is_filterable_in_search=1
再批量设定成 0
UPDATE catalog_eav_attribute SET is_filterable_in_search = 0 WHERE attribute_id IN (SELECT attribute_id FROM eav_attribute WHERE entity_type_id = 4 AND backend_type = 'varchar')
执行查询
SELECT * FROM eav_attribute where attribute_code = "sample_title"; //替换成你上面记录的`attribute_code`
更新掉它
UPDATE eav_attribute SET is_filterable_in_search = 0 WHERE attribute_code = "sample_title";
