What factors decide the size of an SU index?

The size of an SU index depends on the number of documents. That is the most important factor. The size of an index compared to the size of the docs tends to be miniscule. Here are some statistics observed on the current SU customer instances.

The second factor happens to be the doc type; whether the filetype is a video, an article, a case, or another kind of document. For instance, a multimedia article is going to take up more space in the index than a text-only article.