Terminology Clarification

I was reading this ticket, and it seems like a really exciting change: https://github.com/apache/lucene-solr/pull/715

One constraint mentioned here:

  • The segments must have at most one field value per document (otherwise we cannot easily
    determine the matching document IDs through a binary search).

He means DocValues I assume? You can still add other field values to the document. Otherwise, it seems relatively pointless. Would like to confirm since they are being very loose with the wording.

Thanks

He means not more than 1 value(not multi-value ) this field, I guess.