How to get result with filtering from Rakuten WebApi

I am trying get simple filtering result from Rakuten web api test environment. But I am getting same result, have no idea where is a problem?

Here is my "GET" url string which I call:

https://webservice.rakuten.de/merchants/products/getProducts?search="1"&search_field=product_id&key=123456789a123456789a123456789a12