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I know I can query index creation time with curl 'http://localhost:9200/_cat/indices?v&h=index,creation.date.string'.

Is there a similar query which I can check index update time (not creation time)? I need a one-line command to do the same for all indices ...

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For datastreams you can use the following API call to collect the maximum timestamp metrics.

GET _data_stream/_stats

Response:

{
  "_shards": {
    "total": 468,
    "successful": 390,
    "failed": 0
  },
  "data_stream_count": 93,
  "backing_indices": 345,
  "total_store_size_bytes": 41258764754,
  "data_streams": [
    {
      "data_stream": "my-data-stream",
      "backing_indices": 3,
      "store_size_bytes": 20472,
      "maximum_timestamp": 1752188400000 <--- Time unit for milliseconds

    },

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  • You can also use kibana UI:

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As a workaround for regular indices, you can use sub-aggs with .jq

curl  -u username:password -s -X POST "https://localhost:9200/_all/_search?size=0" -H 'Content-Type: application/json' -d '{
  "aggs": {
    "indices": {
      "terms": { "field": "_index", "size": 1000 },
      "aggs": {
        "last_updated": { "max": { "field": "@timestamp" } }
      }
    }
  }
}' | jq -r '.aggregations.indices.buckets[] | "\(.key) \(.last_updated.value_as_string)"'
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