Jim Ferenczi 27d8b4c79c Remove the _all metadata field (elastic/x-pack-elasticsearch#2356)
This change removes the `_all` metadata field. This field is deprecated in 6
and cannot be activated for indices created in 6 so it can be safely removed in
the next major version (e.g. 7).

Relates https://github.com/elastic/elasticsearch/pull/26356

Original commit: elastic/x-pack-elasticsearch@a47133c94e
2017-08-28 13:01:27 +02:00
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