guard 'prepareTransaction' by fcv 'fullyUpgradedTo42'

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    • Repl 2019-01-28
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      Earlier versions of MongoDB will not be able to process the oplog entries that 'prepareTransaction' creates, so before upgrading or when downgrading we should not allow 'prepareTransaction'.

            Assignee:
            Vesselina Ratcheva (Inactive)
            Reporter:
            Judah Schvimer
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