You can use the on_controllers directive on the shell of the Airwave server to push it to all of the controllers. I did the command below on the shell to push the config "logging 192.168.1.25" to my three controllers. You should do it with an harmless command first, to make sure it is working properly.
[root@localhost mercury]# on_controllers "config t logging 192.168.1.25"
(192.168.1.3) #config t logging 192.168.1.25
(192.168.1.27) #config t logging 192.168.1.25
(192.168.1.32) #config t logging 192.168.1.25
[root@localhost mercury]#
(Aruba7640-US) #show logging server
Remote Server: 192.168.1.25
FACILITY MAPPING TABLE
----------------------
local-facility severity remote-facility
-------------- -------- ---------------
All All local1
All controllers will need to have the correct username/password and enable password in Airwave. Do not use if you are managing Instant APs with Airwave, because it will attempt to login to them and run the command.