Use proper elstic search version for travis CI.
Use proper elstic search version for travis CI.

ioanpocol/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb,ioanpocol/superdesk-ntb,petrjasek/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb,ioanpocol/superdesk-ntb,superdesk/superdesk-ntb,superdesk/superdesk-ntb,petrjasek/superdesk-ntb