Use Elasticsearch's new word counter

This will eventually let us get proper word counts for languages that don't
separate their words with spaces.

Bug: 56505

DEPLOYMENT: This won't take effect until everything after an in place
reindex but it isn't important enough to force an in place reindex after
the next deploy.

Change-Id: I9adc2607bd8428116dcd118e279f83f9ba956db0
Merge "Use Elasticsearch's new word counter"