I had uploaded an app to the google play store but after some time I lost its upload-keystore keys. So I unpublish the previous app and re-uploaded the new app.
What I am facing is the previous app is not visible in the search result, but it's accessible from the app download link.
As @Alexander Hoffmann said, This app will be accessible to those who already downloaded the app. If any new user will try to access the app will be get an error like "Something went wrong!"