Fix elasticsearch global code search following...

Fix elasticsearch global code search following https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9655

app/services/search/global_service.rb

@@ -33,7 +33,12 @@ module Search
     end
 
     def scope
-      @scope ||= %w[issues merge_requests milestones].delete(params[:scope]) { 'projects' }
+      @scope ||= begin
+        allowed_scopes = %w[issues merge_requests milestones]
+        allowed_scopes += %w[blobs commits] if current_application_settings.elasticsearch_search?
+
+        allowed_scopes.delete(params[:scope]) { 'projects' }
+      end
     end
   end
 end