getting this error while resore
[31_gu_34_s_56_1.365_1][[31_gu_34_s_56_1.365_1][0]] IndexShardRestoreFailedException[failed to read shard snapshot file]; nested: NoSuchFileException[/root/backup/indices/31_gu_34_s_56_1.365_1/0/snap-31_gu_34_s_56_1.365_1_2016-08-11_18_32_14.dat];
at org.elasticsearch.index.snapshots.blobstore.BlobStoreIndexShardRepository$Context.loadSnapshot(BlobStoreIndexShardRepository.java:352)