Ingest Pipeline issue for upgrading to Elastic/Kibana v8

[fholzer]

Before upgrading, users run the "Upgrade Assistant" to determine if there are any issues that need to be resolved before upgrading to the next major version. For the upgrade from 7.x to 8.x the assistant points out an issue with the cloudflare ingest pipelines:

**The User-Agent ingest processor's ecs parameter is deprecated**
Remove the ecs parameter from your ingest pipelines. The User-Agent ingest processor always returns Elastic Common Schema (ECS) fields in 8.0.