Could not validate a connection to Elasticsearch. No alive nodes found in your cluster

In SearchConfig.php line 81: Could not validate a connection to Elasticsearch. No alive nodes found in your cluster, just disable some module related with Elasticsearch.

Run following command and Disable Elasticsearch

//Just disable some module by command

php bin/magento module:disable {Magento_Elasticsearch,Magento_InventoryElasticsearch,Magento_Elasticsearch6,Magento_Elasticsearch7}

Just disable some module related with Elasticsearch using above command and reinstall Magento.