Purge sls has a static 5.x info while repo uses Jinja template.

[Adam Smith]

beats-formula/beats/purge.sls

Line 5 in 5d8403a

 - name: deb https://artifacts.elastic.co/packages/5.x/apt stable main 

I suggest changing the purge.sls to have a version template in the line instead of a static 5.x version number

[Paolo Smiraglia]

Good catch @absmith82! Are you able to work on a PR?