How to query api with filter options - rest

Question

I am trying filter the response city wise. I am not able to understand how to query filter parameters.
I have tried different ways but with no success. This is the response without applying filter. But I want filter it for a particular city.
{
"index_name": "3b01bcb8-0b14-4abf-b6f2-c1bfd384ba69",
"title": "Real time Air Quality Index from various location",
"desc": "Real time Air Quality Index from various location",
"org_type": "Central",
"org": [
"Ministry of Environment and Forests",
"Central Pollution Control Board"
],
"sector": [
"Industrial Air Pollution"
],
"source": "data.gov.in",
"catalog_uuid": "a3e7afc6-b799-4ede-b143-8e074b27e0621",
"visualizable": "1",
"active": "1",
"created": 1543320551,
"updated": 1559683085,
"created_date": "2018-11-27T17:39:11Z",
"updated_date": "2019-06-05T02:48:05Z",
"target_bucket": {
"index": "air_quality",
"type": "a3e7afc6-b799-4ede-b143-8e074b27e0621",
"field": "3b01bcb8-0b14-4abf-b6f2-c1bfd384ba69"
},
"field": [
{
"id": "id",
"name": "id",
"type": "double"
},
{
"id": "country",
"name": "country",
"type": "keyword"
},
{
"id": "state",
"name": "state",
"type": "keyword"
},
{
"id": "city",
"name": "city",
"type": "keyword"
},
{
"id": "station",
"name": "station",
"type": "keyword"
},
{
"id": "last_update",
"name": "last_update",
"type": "date"
},
{
"id": "pollutant_id",
"name": "pollutant_id",
"type": "keyword"
},
{
"id": "pollutant_min",
"name": "pollutant_min",
"type": "double"
},
{
"id": "pollutant_max",
"name": "pollutant_max",
"type": "double"
},
{
"id": "pollutant_avg",
"name": "pollutant_avg",
"type": "double"
},
{
"id": "pollutant_unit",
"name": "pollutant_unit",
"type": "keyword"
}
],
"status": "ok",
"message": "Resource detail",
"total": 1000,
"count": 10,
"limit": "10",
"offset": "8",
"records": [
{
"id": "13",
"country": "India",
"state": "Andhra_Pradesh",
"city": "Rajamahendravaram",
"station": "Anand Kala Kshetram, Rajamahendravaram - APPCB",
"last_update": "05-06-2019 02:00:00",
"pollutant_id": "CO",
"pollutant_min": "2",
"pollutant_max": "50",
"pollutant_avg": "28",
"pollutant_unit": "NA"
},
{
"id": "14",
"country": "India",
"state": "Andhra_Pradesh",
"city": "Rajamahendravaram",
"station": "Anand Kala Kshetram, Rajamahendravaram - APPCB",
"last_update": "05-06-2019 02:00:00",
"pollutant_id": "OZONE",
"pollutant_min": "37",
"pollutant_max": "132",
"pollutant_avg": "71",
"pollutant_unit": "NA"
}
{
"id": "16",
"country": "India",
"state": "Andhra_Pradesh",
"city": "Tirupati",
"station": "Tirumala, Tirupati - APPCB",
"last_update": "05-06-2019 02:00:00",
"pollutant_id": "PM10",
"pollutant_min": "33",
"pollutant_max": "72",
"pollutant_avg": "55",
"pollutant_unit": "NA"
}
],
"version": "2.1.0"
}
This is only documentation on how to do filtering.
properties: OrderedMap { "id": OrderedMap { "type": "integer" }, "date": OrderedMap { "type": "integer" } }
How to form request url for filtering the response?

Answer 1

yes the documentation is very poor, but still out of many trials I got it work like
this
https://api.data.gov.in/resource/3b01bcb8-0b14-4abf-b6f2-c1bfd384ba69?api-key=<your key>&format=json&offset=0&limit=10
&filters[pollutant_id]=NO2