Further simplify ES migration path #1376
Merged
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See documented instructions.
This migration path requires no downtime in brig. However it assumes that the newly deployed version of brig is able to work with the index from the previous migration. In the upcoming release this is not the case: TeamSettings search will be defunct during the migration, which might take 15 mins for teams up to 10.000 users (guesstimate)).
I've tested this by following the instructions in the "Troubleshooting" section:
2.98.2
(ES migration 2)0.0.1-pr.3429
(ES migration 3) withadditionalWriteIndex: directory_v6