cmccabe commented on a change in pull request #11677:
URL: https://github.com/apache/kafka/pull/11677#discussion_r784429730



##########
File path: clients/src/main/resources/common/message/UpdateFeaturesRequest.json
##########
@@ -30,7 +30,11 @@
       {"name": "MaxVersionLevel", "type": "int16", "versions": "0+",
         "about": "The new maximum version level for the finalized feature. A 
value >= 1 is valid. A value < 1, is special, and can be used to request the 
deletion of the finalized feature."},
       {"name": "AllowDowngrade", "type": "bool", "versions": "0+",
-        "about": "When set to true, the finalized feature version level is 
allowed to be downgraded/deleted. The downgrade request will fail if the new 
maximum version level is a value that's not lower than the existing maximum 
finalized version level."}
-    ]}

Review comment:
       Yes. Just remove it if you are not using it any more.
   
   The only awkward thing is that you need to think about how the defaults 
work. I suppose it should be something like:
   
   If AllowDowngrade = true (which would only be true for RPC version 0) then 
force DowngradeType = SAFE. Otherwise default DowngradeType to NONE.




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