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Register new indexes with the IndexCatalog after getting the commit OpTime in the OpObserver. Set the minVisibleSnapshot to the commit time before registering.
As it is now possible for concurrent creations of the same collection name to race, throw a WriteConflictException if registration fails due to an already existing collection of the same name. Test that conflicts that happen before registration time still return IndexKeySpecsConflict.
Ensure that operations that do not read at a timestamp cannot see an index that has been observed by the OpObserver but that not yet has committed, or has been committed in a newer storage snapshot than that of the reader.
Ensure that the above mechanism also works for non-replicated collections, or keep using MODE_X collection locks for those.