davidradl commented on code in PR #26984:
URL: https://github.com/apache/flink/pull/26984#discussion_r2343888387


##########
docs/content/docs/dev/datastream/fault-tolerance/state.md:
##########
@@ -542,6 +542,15 @@ where at least the first element has expired to determine 
the offset of the next
 e.g. after restart from savepoint.
 - Periodic compaction could only work when TTL is enabled.
 
+### TTL Migration Compatibility
+
+Starting from Flink 2.2.0, Flink supports seamless migration between state 
with and without TTL enabled.
+
+If you previously configured state without TTL and now want to enable it (or 
vice versa),
+this is now safe to do without triggering restore-time errors - as long as you 
are using a supported version.

Review Comment:
   what do you mean by supported version here? I assume this means state 
produced as a supported version of Flink - does this include 1.20? Or does the 
source need to be Flink 2.2.0?



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