What if you disable the app for maintenance, doing the following steps:
- - make sure the users can't access the app.
- - delete all indexes.
- - redeploy a subset of your application for updating the 15 million
entities.
- - redeploy the full application.
- - rebuild the indexes.
- - open access to your application.
A rebuild of an index is likely much cheaper in cost than updating one for
each write.
-Wendel
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