Is this not possible as it was in Drupal 7 to convert taxonomy terms in the URL to their ID?
See this post on Stackexchange: http://drupal.stackexchange.com/questions/174251/taxonomy-term-name-as-c...
I try "Content: Has taxonomy term ID" and set the validator to "term name", but when I try to put in "term name" as a validator and use the term name in the preview box, it looks like it's trying to use the 'tid' field of the taxonomy_index table with the textual value of the term:
WHERE (( (taxonomy_index.tid = 'Discussion') )AND
When I try to use the TID, I just get a 'no query was run' message and nothing is returned.