Just applied the `prevent_indexing` decorator like with the others views. E.g.

    @newrelic.agent.function_trace()
    @allow_CORS_GET
    @prevent_indexing   # <- this is new
    def _document_deleted(request, deletion_logs):
        ...

As a background a "decorator" is a function that wraps another function to not repeat calls of functions and other things again and again. In other words, in the case of the `prevent_indexing` decorator it allows us to first call the wrapped function (the view) and apply the `X-Robots-Tag` on the return value. Then the decorator returns that modified return vale. Take a look at the implementation: https://github.com/darkwing/kuma/blob/doc-delete-981147/apps/wiki/views.py#L173-L179