Add missing package info

Signed-off-by: Atri Sharma <atri.jiit@gmail.com>

Author: atris

server/src/main/java/org/opensearch/search/query/rewriters/package-info.java

@@ -0,0 +1,31 @@
+/*
+ * 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.
+ */
+
+/**
+ * Query rewriting optimizations for improving search performance.
+ * 
+ * <p>This package contains various query rewriters that transform queries
+ * into more efficient forms while maintaining semantic equivalence.
+ * 
+ * <p>The rewriters include:
+ * <ul>
+ *   <li>{@link org.opensearch.search.query.rewriters.BooleanFlatteningRewriter} - 
+ *       Flattens nested boolean queries with single clauses</li>
+ *   <li>{@link org.opensearch.search.query.rewriters.MatchAllRemovalRewriter} - 
+ *       Removes redundant match_all queries from boolean clauses</li>
+ *   <li>{@link org.opensearch.search.query.rewriters.TermsMergingRewriter} - 
+ *       Merges multiple term queries on the same field into a single terms query</li>
+ *   <li>{@link org.opensearch.search.query.rewriters.MustNotToShouldRewriter} - 
+ *       Transforms must_not queries to should queries for better performance</li>
+ *   <li>{@link org.opensearch.search.query.rewriters.MustToFilterRewriter} - 
+ *       Moves scoring-irrelevant queries from must to filter clauses</li>
+ * </ul>
+ * 
+ * @opensearch.internal
+ */
+package org.opensearch.search.query.rewriters;