Normal, Magento 2.4.6 is using Elasticsearch 7 Module. But some server doesn’t install Elasticsearch 7 and have Elasticsearch 8 installed on it. Elasticsearch doesn’t support downgrade Elasticsearch from 8 to 7.

So, you can fix by install Elasticsearch 8 Module on your Magento.

Step 1. install Elasticsearch 8 Module by command line:

composer require magento/module-elasticsearch-8 --with-all-dependencies

Step 2. Turn on Elasticsearch extensions by command line:

php bin/magento module:enable Magento_InventoryElasticsearch Magento_Elasticsearch8 Magento_Elasticsearch

Step 3. Change search engine to elasticsearch 8 by command line

php bin/magento config:set catalog/search/engine elasticsearch8
php bin/magento config:set catalog/search/elasticsearch8_server_hostname "localhost"
php bin/magento config:set catalog/search/elasticsearch8_server_port 9200

Step 4. Reindex, clean and flush cache

php -dmemory_limit=4G bin/magento indexer:reindex && php bin/magento cache:clean && php bin/magento cache:flush

Now, you can check how products show on your website.