Display 1000+ if there's more than 1000 results

For Finders with a large number of documents, such as AAIB Reports, telling the User that there's more results that we display helps them to narrow their search.

As we use `total` from the response, it also made sense to change this in the code.
Would this be better as `@documents` now that this doesn't refer to a `ResultSet` object?