Getting Peak day and corresponding count based on last 30 days data

[Yadhav]

Hi,
I have requirement to get max of count value along with its date in last 7 days time frame.

Below is my kibana visualization setting.

Here I need to get max of count value along with its date. Seeing forward to suggestion

My correxponding ES query:

  "query": {
    "filtered": {
      "query": {
        "query_string": {
          "analyze_wildcard": true,
          "lowercase_expanded_terms": false,
          "query": ""
        }
      },
      "filter": {
        "bool": {
          "must": [
            {
              "query": {
                "query_string": {
                  "query": "*",
                  "analyze_wildcard": true,
                  "lowercase_expanded_terms": false
                }
              }
            },
            {
              "range": {
                "@timestamp": {
                  "gte": 1679843225961,
                  "lte": 1680448025961,
                  "format": "epoch_millis"
                }
              }
            }
          ],
          "must_not": []
        }
      }
    }
  },
  "size": 0,
  "aggs": {
    "7": {
      "date_histogram": {
        "field": "@indexer.timestamp",
        "interval": "1d",
        "time_zone": "EST5EDT",
        "min_doc_count": 1,
        "extended_bounds": {
          "min": 1679843225960,
          "max": 1680448025960
        }
      }
    }
  }
}```

Corresponding response:

```{
    "took": 7270,
    "timed_out": false,
    "_shards": {
        "total": 2244,
        "successful": 2244,
        "failed": 0
    },
    "hits": {
        "total": 1849010,
        "max_score": 0.0,
        "hits": []
    },
    "aggregations": {
        "8": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [
                {
                    "key": "test",
                    "doc_count": 1849010,
                    "9": {
                        "buckets": [
                            {
                                "key_as_string": "2023-03-26T00:00:00.000-04:00",
                                "key": 1679803200000,
                                "doc_count": 19593
                            },
                            {
                                "key_as_string": "2023-03-27T00:00:00.000-04:00",
                                "key": 1679889600000,
                                "doc_count": 395447
                            },
                            {
                                "key_as_string": "2023-03-28T00:00:00.000-04:00",
                                "key": 1679976000000,
                                "doc_count": 382152
                            },
                            {
                                "key_as_string": "2023-03-29T00:00:00.000-04:00",
                                "key": 1680062400000,
                                "doc_count": 365295
                            },
                            {
                                "key_as_string": "2023-03-30T00:00:00.000-04:00",
                                "key": 1680148800000,
                                "doc_count": 356298
                            },
                            {
                                "key_as_string": "2023-03-31T00:00:00.000-04:00",
                                "key": 1680235200000,
                                "doc_count": 301580
                            },
                            {
                                "key_as_string": "2023-04-01T00:00:00.000-04:00",
                                "key": 1680321600000,
                                "doc_count": 25083
                            },
                            {
                                "key_as_string": "2023-04-02T00:00:00.000-04:00",
                                "key": 1680408000000,
                                "doc_count": 3562
                            }
                        ]
                    }
                }
            ]
        }
    }
}```