fix license header

Author: ywangd

server/src/main/java/org/elasticsearch/repositories/ProjectRepo.java

@@ -1,20 +1,11 @@
 /*
- * ELASTICSEARCH CONFIDENTIAL
- * __________________
- *
- * Copyright Elasticsearch B.V. All rights reserved.
- *
- * NOTICE:  All information contained herein is, and remains
- * the property of Elasticsearch B.V. and its suppliers, if any.
- * The intellectual and technical concepts contained herein
- * are proprietary to Elasticsearch B.V. and its suppliers and
- * may be covered by U.S. and Foreign Patents, patents in
- * process, and are protected by trade secret or copyright
- * law.  Dissemination of this information or reproduction of
- * this material is strictly forbidden unless prior written
- * permission is obtained from Elasticsearch B.V.
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
  */
-
 package org.elasticsearch.repositories;
 
 import org.elasticsearch.cluster.DiffableUtils;