Is it possible to add custom parameter to a url?

[farang]

I need to add custom parameter in url for each request. It should be like https://example.com/index/_search?size=10&from=0&q=domain:d1,d2,d3.
Adding q=domain:d1,d2,d3 in requests is important for me. Is that possible?
This is my first time of using ElasticUI, so please sorry if my question is too naive.