javanna commented on code in PR #16756:
URL: https://github.com/apache/lucene/pull/16756#discussion_r4181324242


##########
lucene/MIGRATE.md:
##########
@@ -101,9 +114,9 @@ Starting with Lucene 11.0.0, the index upgrade policy has 
been relaxed to allow
 #### Upgrade Example
 
 ```java
-// Opening an index created with Lucene 10.x in Lucene 11.x+
+// Opening a 10.x index in 11 still works (MIN_SUPPORTED_MAJOR is 10).

Review Comment:
   This is old news that does not take #16741 into account . Reading 9.x 
indices is possible without it, but only via the expert read-only API. An 
`IndexWriter` can't be opened against those indices without the changes from 
#16741 . The wording here mentions "opening" but what is implied is full 
support as far as I understand it. 



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