[FEATURE] add settingsKey when creating the index

With the settingsKey it is possible to set further
Configuration for the Index by using the alias

Author: mgoldbeck

Classes/Flowpack/ElasticSearch/ContentRepositoryAdaptor/Indexer/NodeIndexer.php

@@ -124,7 +124,9 @@ public function setIndexNamePostfix($indexNamePostfix) {
 	 * @return Index
 	 */
 	public function getIndex() {
-		return $this->searchClient->findIndex($this->getIndexName());
+		$index = $this->searchClient->findIndex($this->getIndexName());
+		$index->setSettingsKey($this->searchClient->getIndexName());
+		return $index;
 	}
 
 	/**