Check config on load (#4170)

Co-authored-by: syuilo <syuilotan@yahoo.co.jp>

src/db/elasticsearch.ts

@@ -42,9 +42,10 @@ const index = {
 };
 
 // Init ElasticSearch connection
-const client = config.elasticsearch ? new elasticsearch.Client({
-	host: `${config.elasticsearch.host}:${config.elasticsearch.port}`
-}) : null;
+
+const client = config.elasticsearch.map(({ host, port }) => {
+	return new elasticsearch.Client({ host: `${host}:${port}` });
+}).getOrElse(null);
 
 if (client) {
 	// Send a HEAD request