If your Magento using Elasticsearch . Make sure your elasticsearch is up and running and configured correctly ...
look at the network section and uncomment network.host and set to localhost if elasticsearch is running on localhost.
reindex and flush magento .
Please review the steps below:
Note: If your Magento version is 2.4.x or above then please check if the elastic search is working or not. (ie. curl http://localhost:9200)
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