Nhat Nguyen e9dda75834 Enable soft-deletes by default for 7.0+ indices (#38929)
Today when users upgrade to 7.0, existing indices will automatically
switch to soft-deletes without an opt-out option. With this change, 
we only enable soft-deletes by default for new indices.

Relates #36141
2019-02-25 17:54:29 -05:00
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