ES query

esquery1.json

{
  "query": {
      "bool": {
          "must_not": [],
          "must": [
            {
              "range": {
                "@timestamp": {
                  "gte": "2017-10-01T13:21:03.914477+01:00",
                  "lte": "2017-10-02T13:21:03.914401+01:00"
                }
              }
            },
            {
              "query_string": {
                "query": "type:farm_stats AND site:london"
              }
            }
          ]
        }
  },
  "aggs": {
    "timeseries": {
      "date_histogram": {
        "field": "@timestamp",
        "interval": "minute"
      },
      "aggs": {
        "our_aggregation": {
          "count": {
            "field": "exit_status"
          }
        }
      }
    }
  },
  "size": 0
}