Merges.total_size too large?

I'm looking at my shard stats for one of my indices, and it says that the merge size is way larger than the store size, which seems wrong. Am I supposed to be concerned about this? I have set the refresh_interval to 30s.

  "store": {
    "size": "12.4gb",
    "size_in_bytes": 13359175068,
    "throttle_time": "0s",
    "throttle_time_in_millis": 0
  "merges": {
    "current": 0,
    "current_docs": 0,
    "current_size": "0b",
    "current_size_in_bytes": 0,
    "total": 8945,
    "total_time": "3.6h",
    "total_time_in_millis": 13258698,
    "total_docs": 164817192,
    "total_size": "69.5gb",
    "total_size_in_bytes": 74718348119,
    "total_stopped_time": "0s",
    "total_stopped_time_in_millis": 0,
    "total_throttled_time": "2.1h",
    "total_throttled_time_in_millis": 7765809,
    "total_auto_throttle": "5mb",
    "total_auto_throttle_in_bytes": 5242880

I wouldn't be concerned, unless you are seeing bad performance. Merges happen when documents are added, deleted or updated. So if you're updating/deleting many docs, that will trigger merges to "clean up" the garbage over time. It's a background process and I wouldn't worry about it unless you explicitly have a performance problem you're trying to track down :slight_smile:

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