Fix when collections deleted from pre-prod index
Fix when collections deleted from pre-prod index

We've had a couple of times when valid collections were accidentally
deleted from the prospective index, holding up the publishing of other
new collections. This script can fix this by pulling the documents from
the current production index and adding them back to the pre-production
index.

ucldc/harvester,barbarahui/harvester,mredar/harvester,barbarahui/harvester,ucldc/harvester,mredar/harvester