add tag to keep ES at 8

clusters/cl01tl/applications/tubearchivist/values.yaml

@@ -128,6 +128,10 @@ valkey:
 elasticsearch:
   global:
     storageClass: ceph-block
+  image:
+    registry: docker.io
+    repository: bitnami/elasticsearch
+    tag: 8.18.0-debian-12-r2
   extraEnvVars:
     - name: discovery.type
       value: single-node