tflobbe commented on code in PR #2017:
URL: https://github.com/apache/solr/pull/2017#discussion_r1362576129


##########
solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc:
##########
@@ -68,6 +68,18 @@ In Solr 8, it was possible to add docValues to a schema 
without re-indexing via
 Due to changes in Lucene 9, that isn't possible any more.
 
 == Solr 9.5
+
+=== SchemaVersion upgraded to 1.7
+Starting with Solr 9.5, the default schemaVersion is 1.7.
+With the new schema version, all fields and fieldTypes that support docValues 
(StrField, *PointField, BoolField, etc.)
+will have docValues enabled by default.
+
+In order to upgrade from schemaVersion 1.6 to 1.7, a re-index of all data will 
generally be required.

Review Comment:
   Lucene 9 enforces a strict schema. I believe adding docValues to an existing 
fields will not be allowed. See LUCENE-9334



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