This requires the tsearch_extras Postgres extension. To install the extension,
first install postgresql-9.1-tsearch-extras on both postgres-primary and
postgres-secondary (this would normally be done in a puppet apply, but there are
currently some changes that can't be applied on Postgres machines). Then run
the following as the postgres user on postgres-primary:
$ psql -d zulip -c 'CREATE EXTENSION tsearch_extras SCHEMA zulip;'
In dev environments, you must also run:
$ psql -d zulip_test_template -c 'CREATE EXTENSION tsearch_extras SCHEMA zulip;'
(imported from commit ad0a57c455b3b86002191ac5fb705d8f716f3296)
6c96561624