Bug 17169: Add a facet for ccode fields to ElasticSearch

Bug 17169: Add a facet for ccode fields to ElasticSearch

To test:
1 - Apply patch
2 - Backup your db
3 - Drop and create a new db to ensure your mappings are refreshed from
the patch
4 - add some titles with items with collection codes
5 - search and see collection code facets
6 - sign off

Work to be done:
1 - Replace codes with descriptions

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>