[DOCS] Highlights how to switch to ELSER v2 from v1 (#2555)

(cherry picked from commit 6e22519)

docs/en/stack/ml/nlp/ml-nlp-elser.asciidoc

@@ -61,9 +61,16 @@ one version which is optimized for Intel® silicon. The **Model Management** >
 **Trained Models** page shows you which version of ELSER v2 is recommended to 
 deploy based on your cluster's hardware.
 
-IMPORTANT: ELSER v2 is not backward compatible. If you indexed your data with 
-ELSER v1, you need to reindex it with an ingest pipeline referencing ELSER v2 to 
-be able to use v2 for search.
+
+[discrete]
+[[upgrade-elser-v2]]
+=== Upgrading to ELSER v2
+
+ELSER v2 is not backward compatible. If you indexed your data with ELSER v1, you 
+need to reindex it with an ingest pipeline referencing ELSER v2 to be able to 
+use v2 for search. This {ref}/semantic-search-elser.html[tutorial] shows you how 
+to create an ingest pipeline with an {infer} processor that uses ELSER v2, and 
+how to reindex your data through the pipeline.
 
 // TO DO
 // If you want to learn more about the ELSER v2 improvements, refer to this blog