Drop support for Elasticsearch 6.x metrics store #1342
Merged
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Thanks @danielmitterdorfer for preparing the ground here, it was easy to do. :) I tested that indexes created with the old templates on 7.x still work with the new code. I'm not sure how to test the 6.x -> 7.x upgrade path, though. Is it useful to test?
As usual, this can be reviewed commit by commit if you're so inclined.
Closes #653