# File lib/mongo/session/session_pool.rb, line 113
      def end_sessions
        while !@queue.empty?
          server = ServerSelector.get(mode: :primary_preferred).select_server(@cluster)
          Operation::Command.new(
              :selector => {endSessions: @queue.shift(10_000).collect { |s| s.session_id }},
              :db_name => Database::ADMIN).execute(server)
        end
      rescue
      end