Snapshot restore failure

Elastic Stack Elasticsearch
1

Hi Team,
I am trying to create and restore snapshots to make a huge data set for my testing purposes. Initially, I created few snapshots and restored them successfully. But suddenly I can't restore newly created indices. I haven't made any changes to the system and the only difference is data volume is bigger now.

Elasticsearch version: 6.3.0, single node setup

Snapshot Created
PUT /_snapshot/nuwan-backup2/snapshot_transactions-cl2-2018.11.27-reindexed-x3?wait_for_completion=true
{
"indices": "transactions-2018.11.27-reindexed-1543757375.64",
"ignore_unavailable": true,
"include_global_state": false
}

Output
{
"snapshot": {
"snapshot": "snapshot_transactions-cl2-2018.11.27-reindexed-x3",
"uuid": "JhsmFXmVR12OR-65fCtFXw",
"version_id": 6030099,
"version": "6.3.0",
"indices": [
"transactions-2018.11.27-reindexed-1543757375.64"
],
"include_global_state": false,
"state": "SUCCESS",
"start_time": "2018-12-12T12:32:26.645Z",
"start_time_in_millis": 1544617946645,
"end_time": "2018-12-12T12:32:26.750Z",
"end_time_in_millis": 1544617946750,
"duration_in_millis": 105,
"failures": ,
"shards": {
"total": 5,
"failed": 0,
"successful": 5
}
}
}

Snapshot status

GET /_snapshot/nuwan-backup2/snapshot_transactions-cl2-2018.11.27-reindexed-x3/_status

Output
{
"snapshots": [
{
"snapshot": "snapshot_transactions-cl2-2018.11.27-reindexed-x3",
"repository": "nuwan-backup2",
"uuid": "JhsmFXmVR12OR-65fCtFXw",
"state": "SUCCESS",
"include_global_state": false,
"shards_stats": {
"initializing": 0,
"started": 0,
"finalizing": 0,
"done": 5,
"failed": 0,
"total": 5
},
"stats": {
"number_of_files": 0,
"processed_files": 0,
"total_size_in_bytes": 0,
"processed_size_in_bytes": 0,
"start_time_in_millis": 1544617946662,
"time_in_millis": 78
},
"indices": {
"transactions-2018.11.27-reindexed-1543757375.64": {
"shards_stats": {
"initializing": 0,
"started": 0,
"finalizing": 0,
"done": 5,
"failed": 0,
"total": 5
},
"stats": {
"number_of_files": 0,
"processed_files": 0,
"total_size_in_bytes": 0,
"processed_size_in_bytes": 0,
"start_time_in_millis": 1544617946662,
"time_in_millis": 78
},
"shards": {
"0": {
"stage": "DONE",
"stats": {
"number_of_files": 0,
"processed_files": 0,
"total_size_in_bytes": 0,
"processed_size_in_bytes": 0,
"start_time_in_millis": 1544617946696,
"time_in_millis": 17
}
},
"1": {
"stage": "DONE",
"stats": {
"number_of_files": 0,
"processed_files": 0,
"total_size_in_bytes": 0,
"processed_size_in_bytes": 0,
"start_time_in_millis": 1544617946722,
"time_in_millis": 18
}
},
"2": {
"stage": "DONE",
"stats": {
"number_of_files": 0,
"processed_files": 0,
"total_size_in_bytes": 0,
"processed_size_in_bytes": 0,
"start_time_in_millis": 1544617946662,
"time_in_millis": 18
}
},
"3": {
"stage": "DONE",
"stats": {
"number_of_files": 0,
"processed_files": 0,
"total_size_in_bytes": 0,
"processed_size_in_bytes": 0,
"start_time_in_millis": 1544617946662,
"time_in_millis": 18
}
},
"4": {
"stage": "DONE",
"stats": {
"number_of_files": 0,
"processed_files": 0,
"total_size_in_bytes": 0,
"processed_size_in_bytes": 0,
"start_time_in_millis": 1544617946696,
"time_in_millis": 20
}
}
}
}
}
}
]
}

Snapshot Restore
POST /_snapshot/nuwan-backup2/snapshot_transactions-cl2-2018.11.27-reindexed-x3/_restore
{
"indices": "snapshot-x2",
"ignore_unavailable": true,
"include_global_state": true,
"rename_pattern": "s(.+)",
"rename_replacement": "s$1"
}

Output
{
"snapshot": {
"snapshot": "snapshot_transactions-cl2-2018.11.27-reindexed-x3",
"indices": ,
"shards": {
"total": 0,
"failed": 0,
"successful": 0
}
}
}

No new index generated!

2

I have incorrectly configured restore request, it should be

POST /_snapshot/nuwan-backup2/snapshot_transactions-cl2-2018.11.27-reindexed-x3/_restore
    {
      "indices": "transactions-2018.11.27-reindexed-1543757375.64",
      "ignore_unavailable": true,
      "include_global_state": true,
      "rename_pattern": "transactions-2018.11.27-reindexed-1543757375.64",
      "rename_replacement": "snapshot-x2"
    }
3

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