generate/FetchRequest: forgotten topics is v7+
@@ -263,7 +263,7 @@ FetchRequest => key 1, max version 10
FetchOffset: int64
LogStartOffset: int64 // v5+
PartitionMaxBytes: int32
- ForgottenTopicsData: [=>]
+ ForgottenTopicsData: [=>] // v7+
Topic: string
Partitions: [int32]
