license missing

Signed-off-by: Petar Dzepina <[email protected]>

server/src/main/java/org/opensearch/search/aggregations/bucket/DocCountProvider.java

@@ -1,3 +1,11 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
 /*
  * Licensed to Elasticsearch under one or more contributor
  * license agreements. See the NOTICE file distributed with
@@ -7,7 +15,7 @@
  * not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
@@ -17,6 +25,11 @@
  * under the License.
  */
 
+/*
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 package org.opensearch.search.aggregations.bucket;
 
 import org.apache.lucene.index.DocValues;