Fix 'hosts' key in Elastic 8 configuration

Author: GromNaN

src/DependencyInjection/Configuration.php

@@ -908,6 +908,7 @@ private function addElasticsearchSection(ArrayNodeDefinition $handlerNode)
                     ->end()
                     ->children()
                         ->scalarNode('id')->end()
+                        ->arrayNode('hosts')->prototype('scalar')->end()->end()
                         ->scalarNode('host')->end()
                         ->scalarNode('port')->defaultValue(9200)->end()
                         ->scalarNode('transport')->defaultValue('Http')->end()
@@ -916,7 +917,7 @@ private function addElasticsearchSection(ArrayNodeDefinition $handlerNode)
                     ->end()
                     ->validate()
                     ->ifTrue(function ($v) {
-                        return !isset($v['id']) && !isset($v['host']);
+                        return !isset($v['id']) && !isset($v['host']) && !isset($v['hosts']);
                     })
                     ->thenInvalid('What must be set is either the host or the id.')
                     ->end()

src/DependencyInjection/MonologExtension.php

@@ -304,7 +304,7 @@ private function buildHandler(ContainerBuilder $container, $name, array $handler
                         $factory = class_exists('Elastic\Elasticsearch\ClientBuilder') ? 'Elastic\Elasticsearch\ClientBuilder' : 'Elasticsearch\ClientBuilder';
                         $client->setFactory([$factory, 'fromConfig']);
                         $clientArguments = [
-                            'hosts' => [$handler['elasticsearch']['host']],
+                            'hosts' => $handler['elasticsearch']['hosts'] ?? [$handler['elasticsearch']['host']],
                         ];
 
                         if (isset($handler['elasticsearch']['user'], $handler['elasticsearch']['password'])) {
@@ -313,11 +313,18 @@ private function buildHandler(ContainerBuilder $container, $name, array $handler
                     } else {
                         $client = new Definition('Elastica\Client');
 
-                        $clientArguments = [
-                            'host' => $handler['elasticsearch']['host'],
-                            'port' => $handler['elasticsearch']['port'],
-                            'transport' => $handler['elasticsearch']['transport'],
-                        ];
+                        if (isset($handler['elasticsearch']['hosts'])) {
+                            $clientArguments = [
+                                'hosts' => $handler['elasticsearch']['hosts'],
+                                'transport' => $handler['elasticsearch']['transport'],
+                            ];
+                        } else {
+                            $clientArguments = [
+                                'host' => $handler['elasticsearch']['host'],
+                                'port' => $handler['elasticsearch']['port'],
+                                'transport' => $handler['elasticsearch']['transport'],
+                            ];
+                        }
 
                         if (isset($handler['elasticsearch']['user'], $handler['elasticsearch']['password'])) {
                             $clientArguments['headers'] = [