Create the logger on the service provider instead of on the config fi…

…le, making the config file cacheable

src/Shift31/LaravelElasticsearch/ElasticsearchServiceProvider.php

@@ -2,7 +2,9 @@
 namespace Shift31\LaravelElasticsearch;
 
 use Elasticsearch\ClientBuilder;
+use Illuminate\Support\Arr;
 use Illuminate\Support\ServiceProvider;
+use Monolog\Logger;
 
 class ElasticsearchServiceProvider extends ServiceProvider
 {
@@ -22,6 +24,18 @@ public function register()
     {
         $this->mergeConfigFrom(realpath(__DIR__ . '/../../config/elasticsearch.php'), 'elasticsearch');
         $this->app->singleton('elasticsearch', function ($app) {
+            if (empty($app->config->get('elasticsearch.logger'))) {
+                $config = $app->config->get('elasticsearch');
+
+                $logPath = Arr::get($config, 'elasticsearch.logPath', storage_path('logs/elastic-search.log'));
+                $logLevel = Arr::get($config, 'elasticsearch.logLevel', Logger::WARNING);
+                $logger = ClientBuilder::defaultLogger($logPath, $logLevel);
+                unset($config['logLevel']);
+                unset($config['logPath']);
+                $config['logger'] = $logger;
+                $app->config->set('elasticsearch', $config);
+            }
+
             return ClientBuilder::fromConfig($app->config->get('elasticsearch'));
         });
     }