What's the right way to map response values to DT?

EndUser

According to the manual, DT expects the response to have certain values. However, if the server can't be made to change those parameters but does contain the information, how can I map the response to fields that DT is expecting? For example, DT expect to see {recordsTotal: 14} in the response, but my server wants to send {totalElements:14}. Is there an way to map that value to the expected parameter?

EndUser

Ok, so it says I can use the dataSrc property for a transformation function. Here's an example of what I've tried:

ajax: {
    url: '/position/19',
    dataSrc(json){
        json.recordsTotal=json.totalElements
        console.log('ajax called', json)
        return json.content;
    }
},

(my data containing object is called 'content')

This sets recordsTotal correctly. Now, I need to figure out if I can do the same with the current page and total pages.