compared with
Key
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In the response, the keystate field is intended to be a bitmask for various states. For example:
0x80 = not found
0x00 = found, not persisted
0x01 = found, persisted
0x810 = logically deleted
0x81 = not found

This is primarily because replication can potentially be significantly behind the initial create and we do not want to receive a NOT_FOUND error for the entire set of items being observed in that state. The intent of this being a bitmask is that future extension could allow for this field to indicate if the item is considered in any indexes, etc. Error masks start from the top of the field.