revert back java docs and header

Signed-off-by: Dharin Shah <8616130+Dharin-shah@users.noreply.github.com>

server/src/main/java/org/opensearch/search/fetch/subphase/MatchedQueriesPhase.java

@@ -1,3 +1,33 @@
+/*
+ * 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
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * 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
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
 package org.opensearch.search.fetch.subphase;
 
 import org.apache.lucene.index.LeafReaderContext;
@@ -19,6 +49,11 @@
 import java.util.List;
 import java.util.Map;
 
+/**
+ * Fetches queries that match the document during search phase
+ *
+ * @opensearch.internal
+ */
 public final class MatchedQueriesPhase implements FetchSubPhase {
 
     @Override