We have more than 2000 posts published and we found out that around 300 are completely useless, we have these 300 listed in a csv file, so the idea is upload the file matching each post and unpublish them. This solution will remove the posts from the sitemap in bulk too.
In a similar position to the above user. We are in the midst of a website cleanup and need to unpublish and redirect hundreds of pages. However, there is no bulk method that we are aware of.