Add versioning system for ecs

Author: cotti

config/products.yml

@@ -67,7 +67,7 @@ products:
     versioning: 'curator'
   ecs:
     display: 'Elastic Common Schema (ECS)'
-    versioning: 'stack'
+    versioning: 'ecs'
   ecs-logging:
     display: 'ECS Logging'
     versioning: 'stack'

config/versions.yml

@@ -21,6 +21,9 @@ versioning_systems:
     base: 3.0
     current: 3.1.0
   ess: *all
+  ecs:
+    base: 9.0
+    current: 9.1.0
   self: *stack
   ecctl:
     base: 1.0