ecs: ship latest 1.x for ES 7+, keep ES6 locked to 1.10

Author: yaauie

Diff for: Rakefile

@@ -1,10 +1,9 @@
 require "logstash/devutils/rake"
 
 task :'vendor-ecs-schemata' do
-  # WARNING: v1.11 breaks 6.x (see: https://github.com/elastic/ecs/issues/1649)
-  download_ecs_schemata(:v1, elasticsearch_major: 6, ecs_release_tag: 'v1.10.0')
-  download_ecs_schemata(:v1, elasticsearch_major: 7, ecs_release_tag: 'v1.10.0')
-  download_ecs_schemata(:v1, elasticsearch_major: 8, ecs_release_tag: 'v1.10.0', generated_for: 7) { |template| transform_for_es8!(template) }
+  download_ecs_schemata(:v1, elasticsearch_major: 6, ecs_release_tag: 'v1.10.0') # WARNING: v1.11 breaks 6.x (see: https://github.com/elastic/ecs/issues/1649)
+  download_ecs_schemata(:v1, elasticsearch_major: 7, ecs_release_tag: 'v1.12.1')
+  download_ecs_schemata(:v1, elasticsearch_major: 8, ecs_release_tag: 'v1.12.1', generated_for: 7) { |template| transform_for_es8!(template) }
 
   # PRERELEASE: 8.0 branch
   # when pinning to released tag, remove BETA warning.