Django Haystack override class's index_queryset in subclass

I'm using Django Haystack (with Aldryn Search) to search content on a client site. However, we need to modify the Articles indexed from the Aldryn NewsBlog plugin - Articles assigned to the Intranet Section should not be indexed. So I made a subclass in my plugin to override that like the documentation says to do:

Subclasses can override this method to avoid indexing certain objects.

However, when I try to rebuild the index it says:

aldryn_newsblog.models.Article has more than one 'SearchIndex`` handling it. Please exclude either aldryn_newsblog.search_indexes.ArticleIndex object or search_modifier.search_indexes.BlogHelperIndex object

The documentation is not clear to me what I need to write to have this modify the existing index from the NewsBlog plugin. I don't want to totally exclude it like the error is suggesting, but to subclass it like the documentation says to do.

Here is my search_indexes.py file:

from aldryn_newsblog.search_indexes import ArticleIndex


class BlogHelperIndex(ArticleIndex):

def index_queryset(self):
    # make sure only public posts are pulled
    return self.get_model().objects.exclude(app_config__app_title='DirectConnection')

Solution

I'm a moron. Aldryn Newsblog provides a simple checkbox in the Sections' settings to enable/disable indexing of that section without the need for a code change.