[BUGFIX] Node indexing broken due to required parameter

The recent adjustment of the node indexing to the changed publishing
behavior in Neos broke (manual) node indexing. This change declares the
targetWorkspace parameter to indexNode() optional as intended.

Author: kdambekalns

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

@@ -73,7 +73,7 @@ public function injectSettings(array $settings) {
 	 * @param mixed $targetWorkspace In case this is triggered during publishing, a Workspace will be passed in
 	 * @return void
 	 */
-	public function indexNode(Node $node, $targetWorkspace) {
+	public function indexNode(Node $node, $targetWorkspace = NULL) {
 		$this->nodesToBeRemoved->detach($node);
 		$this->nodesToBeIndexed->attach($node);
 		$this->targetWorkspaceNamesForNodesToBeIndexed[$node->getContextPath()] = $targetWorkspace instanceof \TYPO3\TYPO3CR\Domain\Model\Workspace ? $targetWorkspace->getName() : NULL;