Update records by criteria did not work

[blackkara]

To update records by criteria, documentation indicates below guidance. I just want to increase follower count of a specific user ( I have a custom user object)

curl -X PUT \
-H "Content-Type: application/json" \
-H "CB-Token: <TOKEN>" \
-d '{"search_criteria": {"age":{"lt":30}}, "country_of_birth":"Iran"}' \
https://api.connectycube.com/data/profile/by_criteria

But its missing important thing like where to add operation fields (i.e "inc": {"field_name": "value"})

As a flutter client this is what i have tried

 var url = 'https://api.connectycube.com/data/UserDetail/by_criteria';

 var headers = Map<String, String>();
 headers['CB-Token'] = session.token;
 headers['Content-Type'] = 'application/json';

 var values = ...
 var body = jsonEncode(values);
 This is what the body is ==> "{"search_criteria":{"userId":4388899},"inc":{"userTotalFollowers":1}}

 var response = await http.put(url, headers: headers, body: body);

But it does not update the field of the user.