Removes dead link from ELSER page. (#2818) (#2822)

(cherry picked from commit 068e461)

Co-authored-by: István Zoltán Szabó <istvan.szabo@elastic.co>

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

@@ -434,7 +434,7 @@ To learn more about ELSER performance, refer to the <<elser-benchmarks>>.
 == Further reading
 
 * {ref}/semantic-search-elser.html[Perform semantic search with ELSER]
-* https://www.elastic.co/blog/may-2023-launch-information-retrieval-elasticsearch-ai-model[Improving information retrieval in the Elastic Stack: Introducing Elastic Learned Sparse Encoder, our new retrieval model]
+
 
 
 [[elser-benchmarks]]