diff --git a/doc/local-playbook.yml b/doc/local-playbook.yml
index bd2bee089..6c2d59164 100644
--- a/doc/local-playbook.yml
+++ b/doc/local-playbook.yml
@@ -19,6 +19,8 @@ ui:
 
 antora:
   extensions:
+    - require: '@antora/lunr-extension' # https://gitlab.com/antora/antora-lunr-extension
+      index_latest_only: true
     - require: '@antora/collector-extension'
     - require: '@sntke/antora-mermaid-extension'
       mermaid_library_url: https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs