Trim kibana url madness

See merge request ai3/float-dashboard!1

Leave the _g hash untouched and trim _a with only a few parameters,
notably the lucene query to search for "FQDN*". The wildcard is used to
match both fqdn and "related" that might appear in logs such as
fqdn:port or fqdn/.

Crazy attempt at getting the absurd query string to work.