[MonologBridge] Improve error when HttpClient contract is installed but not the component

Author: GromNaN

Handler/ElasticsearchLogstashHandler.php

@@ -63,7 +63,7 @@ class ElasticsearchLogstashHandler extends AbstractHandler
 
     public function __construct(string $endpoint = 'http://127.0.0.1:9200', string $index = 'monolog', ?HttpClientInterface $client = null, string|int|Level $level = Logger::DEBUG, bool $bubble = true, string $elasticsearchVersion = '1.0.0')
     {
-        if (!interface_exists(HttpClientInterface::class)) {
+        if (!$client && !class_exists(HttpClient::class)) {
             throw new \LogicException(\sprintf('The "%s" handler needs an HTTP client. Try running "composer require symfony/http-client".', __CLASS__));
         }