sergehuber commented on code in PR #738:
URL: https://github.com/apache/unomi/pull/738#discussion_r2478223748


##########
manual/src/main/asciidoc/whats-new.adoc:
##########
@@ -16,14 +16,130 @@
 Apache Unomi 3 is a new release focused on integrations of the client to 
support elasticsearch version 9.
 It also include the upgrade of the Karaf version.
 
-==== Elasticsearch client upgrade
+=== Elasticsearch client upgrade
 
 The official client for Elasticsearch has been added to Apache Unomi in 
version 3.0 in order to replace the old rest-client which
 is not supported anymore.
 
 The documentation of the client can be found here: 
https://www.elastic.co/docs/reference/elasticsearch/clients/java
 
-==== Karaf upgrade
+=== Migrate from Elasticsearch 7 to Elasticsearch 9
+
+You can use the *remote reindex* API to upgrade directly from Elasticsearch 7 
to Elasticsearch 9. This approach runs both clusters in parallel and uses 
Elasticsearch's remote reindex feature.
+
+This upgrade relies on a script that was specifically built taking jCustomer 
into consideration. If you are sharing the Elasticsearch instance with other 
projects, it might need to be adjusted.

Review Comment:
   Not sure people will know what jCustomer is, maybe we should just say a 
custom Unomi application instead ?



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