janhoy commented on a change in pull request #371:
URL: https://github.com/apache/solr/pull/371#discussion_r738370235
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File path: solr/solr-ref-guide/src/major-changes-in-solr-9.adoc
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@@ -181,6 +181,8 @@ The only reason QEC supported the data directory was to
support loading its chan
That feature now works from the configset dir too.
SolrCloud doesn't support that but may sometime.
+* If you plan to use a rolling upgrade strategy from an 8.x version prior to
8.5, you'll first need to do a rolling upgrade to the latest 8.x version. This
is due to a change in the Overseer response format serialization in version
8.5. See <<solr-upgrade-notes.adoc#_solr_8_5,8.5 Upgrade Notes>> for details.
+
Review comment:
I committed this release-note to highlight the importance of first
upgrading to latest 8.x if you want to do rolling upgrade to 9.0.
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