HSEARCH-3776 Fix the visibility of IndexWriterDelegatorImpl#closeAfte…

…rFailure

No one should use this except IndexWriterProvider.

Not related to this PR, but while we're at it...

backend/lucene/src/main/java/org/hibernate/search/backend/lucene/lowlevel/writer/impl/IndexWriterDelegatorImpl.java

@@ -145,7 +145,7 @@ void close() throws IOException {
 		}
 	}
 
-	public void closeAfterFailure(Throwable throwable, Object failingOperation) {
+	void closeAfterFailure(Throwable throwable, Object failingOperation) {
 		Exception exceptionToReport = log.uncommittedOperationsBecauseOfFailure( throwable.getMessage(), eventContext, throwable );
 		try {
 			close();