[#4321] Change solr type of 'labels' field

Change to white-space-tokenized string field instead of text
field to get exact whole-word matching without stemming.

Copyfield added to solr schema to create new _ws on the fly
during reindexing, while still allowing the existing code
to work with the existing _t field.

After reindexing is complete, do a global
s/labels_t/labels_ws/ on the project (already tested).

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
6 files changed