I've working on a using the silverstripe-fulltextsearch module with the tagfield module. All pages on the site I'm working on can have tags assigned to them which is fine and all set up but I am not entirely sure how to tell silverstripe to index the property on the page as a multivalued field. I've looked through the silverstripe-fulltextsearch docs but haven't found anything that looks like it would be correct.
It's a bit of a trick to push tags into Solr and get them searchable. Here's a sample new index which is typical of pushing tags into Solr. In this example I push the ID of the tag (which doesn't change if the tag title does) then on the front end search normally I'd have a dropdown and filter by a given tag ID.. Something like