PHP Fatal error: Uncaught Error: Class ‘\Elasticsearch\Serializers\SmartSerializer‘ not found in /h

  Class file exists, but prompt cannot load “elasticsearch \ serializers \ smartserializer”

PHP Fatal error:  Uncaught Error: Class '\Elasticsearch\Serializers\SmartSerializer' not found in /home/wwwroot/es-task/vendor/elasticsearch/src/Elasticsearch/ClientBuilder.php:488

Find classes that are not loaded directly. Use require_ Once “class name path”;