In order to remove content from Google's index, remove the page itself or use a robots.txt file or Meta tags to block the site from being included in search results.
The following links are provided for your convenience:
How to block pages using a robots.txt file?
How do I remove a page from Google's search results?
Webpage removal request tool
Note: We provide links to third-party websites in an effort to help you resolve your issue. We are not responsible for the information on third-party websites, and we cannot assist in implementing the solutions on these websites.