result.json

{
  "query": {
    "bool": {
      "must": [
        {
          "term": {
            "event": {
              "value": true
            }
          }
        },
        {
          "bool": {
            "should": [
              {
                "match": {
                  "city": {
                    "query": "istanbul"
                  }
                }
              },
              {
                "term": {
                  "categoryId": {
                    "value": 3
                  }
                }
              },
              {
                "bool": {
                  "must": [
                    {
                      "range": {
                        "startDate": {
                          "gte": "2018-05-15T11:48:28.7168695+03:00"
                        }
                      }
                    },
                    {
                      "range": {
                        "endDate": {
                          "lte": "2018-05-22T11:48:28.7168695+03:00"
                        }
                      }
                    }
                  ]
                }
              }
            ]
          }
        }
      ]
    }
  }
}