It doesn't. To reproduce: 1. Open your logs: $ restart_all ; tail -f /var/log/koha/kohadev/*.log 2. Open the advanced search page 3. Search on ISBN and/or ISSN, for the term 123:456=789 => FAIL: The logs =~ m/ [WARN] WARNING: query problem with nb=(rk=(123:456=789)) ZOOM error 10014 "CCL parsing error" (addinfo: "Unknown qualifier") from diag-set 'ZOOM' at /kohadevbox/koha/C4/Search.pm line 350.
Quoting works nicely where we construct the searches from data int he records, but not sure about auto-quoting manual inputs because I believe this disables truncation with * in Zebra and possibly in Elasticsearch has a similar effect?