elasticsearch query built by elastica 2.x

es.json

{
  "query": {
    "function_score": {
      "query": {
        "filtered": {
          "query": {
            "bool": {
              "minimum_number_should_match": 0
            }
          },
          "filter": {
            "bool": {
              "must": [
                {
                  "and": [
                    {
                      "or": [
                        {
                          "term": {
                            "availability.week_days.day": "3"
                          }
                        },
                        {
                          "term": {
                            "available_days.date": "2015-11-18"
                          }
                        }
                      ]
                    },
                    {
                      "or": [
                        {
                          "term": {
                            "availability.week_days.day": "4"
                          }
                        },
                        {
                          "term": {
                            "available_days.date": "2015-11-19"
                          }
                        }
                      ]
                    }
                  ]
                },
                {
                  "term": {
                    "country": "gb"
                  }
                }
              ],
              "must_not": [
                {
                  "nested": {
                    "path": "bookings",
                    "filter": {
                      "and": [
                        {
                          "range": {
                            "pickup_date": {
                              "lte": "2015-11-20T00:00:00+0100"
                            }
                          }
                        },
                        {
                          "range": {
                            "return_date": {
                              "gte": "2015-11-18T00:00:00+0100"
                            }
                          }
                        }
                      ]
                    }
                  }
                },
                {
                  "nested": {
                    "path": "exceptional_dates",
                    "filter": {
                      "range": {
                        "date": {
                          "gte": "2015-11-18",
                          "lte": "2015-11-20"
                        }
                      }
                    }
                  }
                }
              ]
            }
          }
        }
      },
      "functions": [
        {
          "gauss": {
            "location": {
              "origin": "51.458866596222,-0.21000623703003",
              "scale": "2km",
              "offset": "1km",
              "decay": 0.5
            }
          }
        },
        {
          "script_score": {
            "script": "_score * doc['boost'].value"
          }
        }
      ]
    }
  },
  "fields": [
    "_source"
  ],
  "from": 0,
  "size": 10,
  "script_fields": {
    "current_distance": {
      "script": "doc['location'].distanceInKm(lat,lon)",
      "params": {
        "lat": 51.458866596222,
        "lon": -0.21000623703003
      },
      "lang": "groovy"
    }
  },
  "post_filter": {
    "geo_distance_range": {
      "to": "30km",
      "location": {
        "lat": 51.458866596222,
        "lon": -0.21000623703003
      }
    }
  }
}