ES_percentiles_bucket

{
  "size": 0,
  "aggs": {
    "items": {
      "terms": {
        "field": "item",
        "size": 0
      },
      "aggs":{
        "max_ts":{"max":{"field":"@timestamp"}},
        "min_ts":{"min":{"field":"@timestamp"}},
        "lifetime":{
          "bucket_script":{
            "buckets_path":{
              "minTs":"min_ts",
              "maxTs":"max_ts"
            },
            "script": "((maxTs - minTs)/(1000*3600*24)).toInteger()"
          }
        }
      }
    },
    "percentiles_lifetime":{
      "percentiles_bucket":{
        "buckets_path":"items>lifetime",
        "percents": [ 90.0, 95.0, 99.0 ]
      }
    }
  }
}