As a front-end user, I want to sort documents by document date so I can find the oldest or newest records within my search results when document date is known

[rlskoeser]

testing notes

Try out the new document sort features on the document search on the test site and see if they work the way you expect. Documents without a date should sort last. Note that sorting will only work on documents with standard dates that can be parsed by the new system, so there may be some dates that display that cannot be used for filtering or sorting.

dev notes

• index earliest/latest dates
• add sort options (both directions)
• filter correctly in the view

[richmanrachel]

Looks perfect!