feature #547 Fix hosts key in Elastic 8 configuration (GromNaN)

This PR was merged into the 4.x branch.

Discussion
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Fix `hosts` key in Elastic 8 configuration

| Q             | A
| ------------- | ---
| Branch?       | 3.x
| Bug fix?      | yes
| New feature?  | yes
| Deprecations? | no
| Issues        | Fix #499
| License       | MIT

Elastica 8+ client has an option `hosts` instead of `host` (ruflin/Elastica#2188).

Adding a new `monolog.handlers.(elastica|elastic_search).elasticsearch.hosts` setting that is a list of strings.

This way, we don't try to detect which version of elastica is used, an let the developers set the correct configuration depending on the version they have installed.

Commits
-------

a7f8dc0 Fix 'hosts' key in Elastic 8 configuration

Author: GromNaN

src/DependencyInjection/Configuration.php

@@ -782,6 +782,7 @@ private function addElasticsearchSection(ArrayNodeDefinition $handlerNode): void
                     ->end()
                     ->children()
                         ->scalarNode('id')->end()
+                        ->arrayNode('hosts')->prototype('scalar')->end()->end()
                         ->scalarNode('host')->end()
                         ->scalarNode('port')->defaultValue(9200)->end()
                         ->scalarNode('transport')->defaultValue('Http')->end()
@@ -790,7 +791,7 @@ private function addElasticsearchSection(ArrayNodeDefinition $handlerNode): void
                     ->end()
                     ->validate()
                     ->ifTrue(function ($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

@@ -268,7 +268,7 @@ private function buildHandler(ContainerBuilder $container, string $name, array $
                         $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'])) {
@@ -277,11 +277,18 @@ private function buildHandler(ContainerBuilder $container, string $name, array $
                     } 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'] = [