add stream done when there is no file (should not happen)

modules/elasticsearch/src/main/java/org/elasticsearch/index/gateway/blobstore/BlobStoreIndexShardGateway.java

@@ -645,6 +645,7 @@ public abstract class BlobStoreIndexShardGateway extends AbstractIndexShardCompo
         }
         if (!blobs.containsKey(firstFileToRecover)) {
             // no file, what to do, what to do?
+            recoveryThrottler.streamDone(shardId, fileToRecover.name());
             logger.warn("no file [{}] to recover, even though it has md5, ignoring it", fileToRecover.name());
             latch.countDown();
             return;