Search results appearing for content no longer in a project

Hello! We recently migrated a project into 2 projects.

Our mobile SDKs and our Web SDKs were all in a project

We moved the SDKs to a new project and left the web documentation in the old project

However, when I use the search feature on the original project where we now keep our web API documentation, content is displayed in the results that have moved to the new SDK project. The original content URL is being returned as the search result, and the user then sees a 404 error since the content is no longer in that project.

Is there a period of time search caches results? It's been several weeks since the project migration. Is there a way to remove these results from showing?