{
  "size": 0,
  "aggs": {
    "by_pids": {
      "terms": {
        "field": "pid",
        "size": 100
      },
      "aggs": {
        "min_time": {
          "min": {
            "field": "time"
          }
        },
        "max_time": {
          "max": {
            "field": "time"
          }
        },
        "time_diff": {
          "bucket_script": {
            "buckets_path": {
              "max_time": "max_time",
              "min_time": "min_time"
            },
            "script": "params.max_time - params.min_time"
          }
        },
        "time_diff_sort": {
          "bucket_sort": {
            "sort": [
              {
                "time_diff" : {
                  "order" : "desc"
                }
              }
            ]
          }
        }
      }
    }
  }
}