Update docs for ESWrapper

src/main/kotlin/helpers/ElasticSearchWrapper.kt

@@ -38,6 +38,8 @@ class ElasticSearchWrapper(settings: Properties) {
     /**
      * Establishes a connection to the client and ensures, that the index is present. The index may be an alias
      * or an index directly.
+     *
+     * @return Elasticsearch Client
      */
     private fun connect(): RestHighLevelClient? {
         return try {