g.command 'query' do |c|
          c.flag 'datastore', desc: 'Name of the datastore.'
          c.flag 'app_id', desc: 'Required if calling with user token.'
          c.flag 'cursor', desc: 'Set cursor to next_cursor returned by the previous call to list items in the next page.'
          c.flag 'expression', desc: 'A query filter expression https://api.slack.com/future/datastores.'