Okay, does the go to action redirect you to the index page?
if the “go to” action goes to the index page, then all your follow up action should be in the index page. That is, the creation of the search request and the go to my_search_request redirection. All should be in the index page.
So that the user would be further redirected from there.
But I am abit skeptical that login from popup would direct you to the index page because I am familiar with the workflows in the cavas.