Add getter for path field in NestedQueryBuilder (#4636)

CHANGELOG.md

@@ -21,6 +21,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [Segment Replication] Add snapshot and restore tests for segment replication feature ([#3993](https://github.com/opensearch-project/OpenSearch/pull/3993))
 - Added missing javadocs for `:example-plugins` modules ([#4540](https://github.com/opensearch-project/OpenSearch/pull/4540))
 - Add missing Javadoc tag descriptions in unit tests ([#4629](https://github.com/opensearch-project/OpenSearch/pull/4629))
+- Add getter for path field in NestedQueryBuilder ([#4636](https://github.com/opensearch-project/OpenSearch/pull/4636))
 ### Dependencies
 - Bumps `log4j-core` from 2.18.0 to 2.19.0
 - Bumps `reactor-netty-http` from 1.0.18 to 1.0.23

server/src/main/java/org/opensearch/index/query/NestedQueryBuilder.java

@@ -130,6 +130,13 @@ protected void doWriteTo(StreamOutput out) throws IOException {
         out.writeBoolean(ignoreUnmapped);
     }
 
+    /**
+     * Returns path of the nested query.
+     */
+    public String path() {
+        return path;
+    }
+
     /**
      * Returns the nested query to execute.
      */

server/src/test/java/org/opensearch/index/query/NestedQueryBuilderTests.java

@@ -147,6 +147,10 @@ public void testSerializationBWC() throws IOException {
         }
     }
 
+    public void testPath() {
+        assertEquals("nested1", createTestQueryBuilder().path());
+    }
+
     public void testValidate() {
         QueryBuilder innerQuery = RandomQueryBuilder.createQuery(random());
         IllegalArgumentException e = expectThrows(