Unmute testIndexingWithPrimaryOnBwcNodes (#9742)

Signed-off-by: Suraj Singh <surajrider@gmail.com>

qa/mixed-cluster/src/test/java/org/opensearch/backwards/IndexingIT.java

@@ -114,7 +114,6 @@ private void printClusterRouting() throws IOException, ParseException {
      * This test verifies that segment replication does not break when primary shards are on lower OS version. It does this
      * by verifying replica shards contains same number of documents as primary's.
      */
-    @AwaitsFix(bugUrl = "https://github.com/opensearch-project/OpenSearch/issues/9685")
     public void testIndexingWithPrimaryOnBwcNodes() throws Exception {
         if (UPGRADE_FROM_VERSION.before(Version.V_2_4_0)) {
             logger.info("--> Skip test for version {} where segment replication feature is not available", UPGRADE_FROM_VERSION);