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The following commit(s) were added to refs/heads/main by this push:
new ba51f24f672 Fix upgrade notes Solr 9 (#1992)
ba51f24f672 is described below
commit ba51f24f672675c14beb24fcbd80878cb5b638b0
Author: aarrietagit <[email protected]>
AuthorDate: Sun Oct 8 12:22:51 2023 -0300
Fix upgrade notes Solr 9 (#1992)
Add a note about Lucene's two-major-version upgrade
limitation to make it a little more visible.
---
.../modules/upgrade-notes/pages/major-changes-in-solr-9.adoc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git
a/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
b/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
index ad7649f6d54..ec709ca2162 100644
---
a/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
+++
b/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
@@ -59,7 +59,7 @@ A rolling upgrade from Solr 8 to Solr 9 requires the
following multiple restart
=== Reindexing After Upgrade
-It is always strongly recommended that you fully reindex your documents after
a major version upgrade. For details, see the
xref:indexing-guide:reindexing.adoc[] section, which covers several strategies
for how to reindex.
+It is always strongly recommended that you fully reindex your documents after
a major version upgrade if collection was created in Solr 8. It is mandatory to
reindex your documents if collection was created on Solr 7 or older. For
details, see the xref:indexing-guide:reindexing.adoc[] section, which covers
several strategies for how to reindex.
In Solr 8, it was possible to add docValues to a schema without re-indexing
via `UninvertDocValuesMergePolicy`, an advanced/expert utility.
Due to changes in Lucene 9, that isn't possible any more.
