Adds reference to E5 model in ELSER docs. (#2624)

(cherry picked from commit 102374f)

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

@@ -18,6 +18,10 @@ meaning and user intent, rather than exact keyword matches.
 ELSER is an out-of-domain model which means it does not require fine-tuning on 
 your own data, making it adaptable for various use cases out of the box.
 
+This model is recommended for English language documents and queries. If you 
+want to perform semantic search on non-English language documents, use the 
+<<ml-nlp-e5>> model.
+
 IMPORTANT: While ELSER V2 is generally available, ELSER V1 is in experimental:[]
 and will remain in technical preview.