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fed2a1a822
* Fix Translog.Delete serialization for sequence numbers Translog.Delete used `.writeVLong` instead of `.writeLong` for the sequence number and primary term (and their respective "read" variants). This could lead to issues where a 5.x node sent a translog operation with a negative sequence number (-2 for unassigned seq no) that tripped an assertion serializing a negative number and causing ES to exit. Adds a unit test for serialization and a mixed-cluster REST test, since that was how this was originally caught. * Use more realistic values for random seqNum and primary term * Add comment with TODO for removal in 7.0 * Change comment into an assert