Page tag to disable indexing

Is there a page tag that disables indexing for that page?

I automatically generate a number of files. In (almost) all cases these should be indexed. In some situations the content is not relevant and I would like for them not to show up in the index. Deleting the files will not work as they will be re-generated. A page level tag that could be added manually that disables indexing would be really helpful in this case.