thx for your response
but in Discover, 'columns' get parameter is nowhere in my url.
my url format is
http://ip:port/app/kibana#/discover/21d19380-1ea9-11e9-874b-eb2dc0f64944?_g=h@44136fa&_a=h@1d7ed07
and, when i save search object and i configed 'Management' -> 'Saved Object' -> saved Search Object -> 'columns' property like this
["date","_source"]
but nothing changed ( i checked that i saved Search Object button)
-------add
i found solution.
problem was 'Management' -> 'advanced settings' -> 'Store URLs in session storage'
if this option is on, kibana doesn't show 'get parameters'.
off this option. then, 'columns' get parameter appeared.
and change 'columns:!(date)' to 'columns:!(date,_source)',
then kibana can show '_source.date' and '_source'.
and if we save this search object, we can see 'date' and '_source' in dashboard always.
---- add
and, if save search object once like above, and config 'Store URLs in session storage' again (there are reasons for URL's length issue),
this feature is not changed like this both Discover and DashBoard that including saved search object.
like this, very useful.
thx 