Add back RemoteFsTranslog.getRemoteTranslogTracker()

Signed-off-by: Bhumika Saini <sabhumik@amazon.com>

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

@@ -134,6 +134,11 @@ public RemoteFsTranslog(
         }
     }
 
+    // visible for testing
+    RemoteTranslogTransferTracker getRemoteTranslogTracker() {
+        return remoteTranslogTransferTracker;
+    }
+
     public static void download(Repository repository, ShardId shardId, ThreadPool threadPool, Path location, Logger logger)
         throws IOException {
         assert repository instanceof BlobStoreRepository : String.format(

server/src/main/java/org/opensearch/index/translog/transfer/TranslogTransferManager.java

@@ -147,6 +147,7 @@ public boolean transferSnapshot(TransferSnapshot transferSnapshot, TranslogTrans
 
             uploadStartTime = System.nanoTime();
             // TODO: Ideally each file's upload start time should be when it is actually picked for upload
+            // https://github.com/opensearch-project/OpenSearch/issues/9729
             fileTransferTracker.recordFileTransferStartTime(uploadStartTime);
             transferService.uploadBlobs(toUpload, blobPathMap, latchedActionListener, WritePriority.HIGH);
 
@@ -199,6 +200,7 @@ public boolean transferSnapshot(TransferSnapshot transferSnapshot, TranslogTrans
     private void captureStatsBeforeUpload() {
         remoteTranslogTransferTracker.incrementTotalUploadsStarted();
         // TODO: Ideally each file's byte uploads started should be when it is actually picked for upload
+        // https://github.com/opensearch-project/OpenSearch/issues/9729
         remoteTranslogTransferTracker.addUploadBytesStarted(fileTransferTracker.getTotalBytesToUpload());
     }