Migration aliases for 8.0

[andrewkroh]

For the transition from 6.x to 7.0 Beats added a configuration option to add alias fields to index templates pointing from the old field to the new field. Those need to be removed.

beats/libbeat/idxmgmt/idxmgmt.go

Line 114 in 95626b8

Migration *common.Config `config:"migration.6_to_7"`

Changes

• Remove migration aliases from fields.yml files.
• Change migration.6_to_7 to migration.7_to_8
• Delete dev-tools/ecs-migration.yml.

For 8.0 we will track migrations inside of dev-tools/ecs-migration-8x.yml. The file will have the same format as the previous dev-tools/ecs-migration.yml. It's moved into the script directory to be colocated with the two scripts that used the file.

New migration aliases for 8.0 can then begin to be added to the fields.yml files as they were in the past.

[elasticmachine]

Pinging @elastic/integrations-services (Team:Services)

[botelastic]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[dedemorton]

Reopening because this autoclosed. Looks like migration.6_to_7 still exists in the configuration file and needs to be removed.

I'm not sure which other parts of this work has been done or not done.

[botelastic]

Hi!
We just realized that we haven't looked into this issue in a while. We're sorry!

We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1.
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