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As part of changing the CollectionIndexes to use the UUID instead of the CollectionGeneration, we will need to update the ComparableIndexVersion.
As part of this ticket we need to:
- Make the comparableIndexVersion contain only the index timestamp and a forced refresh sequence number
- Change the comparison of ComparableIndexVersions so that all boost::none index versions compare as the same
- Ensure that any transition from boost::none -> valid timestamp or timestamp -> boost::none triggers a refresh
- Modify the index cache to make the GlobalIndexesCache optional --> we should not get a GlobalIndexesCache object from the cache if the time in store is boost::none
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