Fix flaky test in RemoteStoreMigrationSettingsUpdateIT (#16048)

Signed-off-by: Ashish Singh <ssashish@amazon.com>

Author: ashking94

server/src/internalClusterTest/java/org/opensearch/remotemigration/RemoteStoreMigrationSettingsUpdateIT.java

@@ -12,6 +12,7 @@
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.settings.SettingsException;
 import org.opensearch.common.unit.TimeValue;
+import org.opensearch.repositories.blobstore.BlobStoreRepository;
 import org.opensearch.test.InternalTestCluster;
 import org.opensearch.test.OpenSearchIntegTestCase;
 
@@ -68,15 +69,17 @@ public void testNewIndexIsRemoteStoreBackedForRemoteStoreDirectionAndMixedMode()
         assertRemoteStoreBackedIndex(indexName2);
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/opensearch-project/OpenSearch/issues/15793")
     public void testNewRestoredIndexIsRemoteStoreBackedForRemoteStoreDirectionAndMixedMode() throws Exception {
         logger.info("Initialize cluster: gives non remote cluster manager");
         initializeCluster(false);
 
         logger.info("Add remote and non-remote nodes");
         setClusterMode(MIXED.mode);
         addRemote = false;
-        String nonRemoteNodeName = internalCluster().startNode();
+        Settings settings = Settings.builder()
+            .put(BlobStoreRepository.SNAPSHOT_SHARD_PATH_PREFIX_SETTING.getKey(), snapshotShardPathFixedPrefix ? "c" : "")
+            .build();
+        String nonRemoteNodeName = internalCluster().startNode(settings);
         addRemote = true;
         String remoteNodeName = internalCluster().startNode();
         internalCluster().validateClusterFormed();

test/framework/src/main/java/org/opensearch/test/OpenSearchIntegTestCase.java

@@ -403,7 +403,7 @@ public abstract class OpenSearchIntegTestCase extends OpenSearchTestCase {
 
     private static Boolean segmentsPathFixedPrefix;
 
-    private static Boolean snapshotShardPathFixedPrefix;
+    protected static Boolean snapshotShardPathFixedPrefix;
 
     private Path remoteStoreRepositoryPath;
 
@@ -2904,7 +2904,7 @@ private static Settings buildRemoteStoreNodeAttributes(
         settings.put(RemoteStoreSettings.CLUSTER_REMOTE_STORE_PINNED_TIMESTAMP_ENABLED.getKey(), randomBoolean());
         settings.put(RemoteStoreSettings.CLUSTER_REMOTE_STORE_SEGMENTS_PATH_PREFIX.getKey(), translogPathFixedPrefix ? "a" : "");
         settings.put(RemoteStoreSettings.CLUSTER_REMOTE_STORE_TRANSLOG_PATH_PREFIX.getKey(), segmentsPathFixedPrefix ? "b" : "");
-        settings.put(BlobStoreRepository.SNAPSHOT_SHARD_PATH_PREFIX_SETTING.getKey(), segmentsPathFixedPrefix ? "c" : "");
+        settings.put(BlobStoreRepository.SNAPSHOT_SHARD_PATH_PREFIX_SETTING.getKey(), snapshotShardPathFixedPrefix ? "c" : "");
         return settings.build();
     }