diff --git a/etc/kayobe/kolla/config/fluentd/output/03-opensearch.conf b/etc/kayobe/kolla/config/fluentd/output/03-opensearch.conf
index 9106c4175..6b873e3f9 100644
--- a/etc/kayobe/kolla/config/fluentd/output/03-opensearch.conf
+++ b/etc/kayobe/kolla/config/fluentd/output/03-opensearch.conf
@@ -4,7 +4,7 @@
     @type copy
     <store>
        @type opensearch
-       host { opensearch_address }}
+       host {{ opensearch_address }}
        port {{ opensearch_port }}
        logstash_format true
        logstash_prefix apel
diff --git a/releasenotes/notes/fix-fluentd-opensearch-template-14bde9b6d5a723f8.yaml b/releasenotes/notes/fix-fluentd-opensearch-template-14bde9b6d5a723f8.yaml
new file mode 100644
index 000000000..b5e98506a
--- /dev/null
+++ b/releasenotes/notes/fix-fluentd-opensearch-template-14bde9b6d5a723f8.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix missing bracket in fluentd OpenSearch configuration
+    causing container crashes when caso is enabled.