We are trying to create a newer site A, and copy all documents from an older site B to site A. Then delete the entire site B.
We would like to make sure that all previously indexed search results from site B is purged, so they do not interfere with searched results in the newer site A. Is this done automatically when we delete the Site B? How long does it take for SharePoint crawler to catch up? Is there something we could do manually to let SharePoint purge the old index immediately after we delete site B?