Debug elastcisearch8 connection

Author: djadobe16

app/code/Magento/Elasticsearch/Setup/Validator.php

@@ -44,7 +44,7 @@ public function validate(): array
             echo "<pre>$output</pre>";
 
 
-            $output = shell_exec("cat /var/log/elasticsearch/elasticsearch.log");
+            $output = shell_exec("sudo cat /var/log/elasticsearch/elasticsearch.log");
             echo "<pre>$output</pre>";
 
             $client = $this->clientResolver->create();