wanghao a0c32cbe4d Fix tempest error
pymongo has removed the ensure_index since 4.0.0.
So we need to update ensure_index to create_index
Fix the error that couldn't create subscription sucessfully.

Change-Id: Ic27e6e885ec5a575ebc168d91eee761177013b9d
2022-09-15 15:56:14 +08:00
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