diff --git a/chart/fluent-bit-configs/output-nginx.conf b/chart/fluent-bit-configs/output-nginx.conf
index 08bea13..0cf5167 100644
--- a/chart/fluent-bit-configs/output-nginx.conf
+++ b/chart/fluent-bit-configs/output-nginx.conf
@@ -19,6 +19,7 @@
     Include_Tag_Key     Off
     Time_Key_Nanos      Off
     Generate_ID         On
+    write_operation     upsert
     tls                 On
     tls.Verify          On
     {{- if or .Values.fluentbit.caCertificateSecret .Values.opensearch.externalOpensearch.disabled }}
diff --git a/chart/templates/fluent-bit/fluent-bit-config-sec.yaml b/chart/templates/fluent-bit/fluent-bit-config-sec.yaml
index 6411b15..12d3b0e 100644
--- a/chart/templates/fluent-bit/fluent-bit-config-sec.yaml
+++ b/chart/templates/fluent-bit/fluent-bit-config-sec.yaml
@@ -142,6 +142,7 @@ stringData:
         Include_Tag_Key     Off
         Time_Key_Nanos      Off
         Generate_ID         On
+        write_operation     upsert
         tls                 On
         tls.Verify          On
         {{- if or .Values.fluentbit.caCertificateSecret .Values.opensearch.externalOpensearch.disabled }}
@@ -174,6 +175,7 @@ stringData:
         Time_Key_Nanos      On
         {{- end }}
         Generate_ID         On
+        write_operation     upsert
         tls                 On
         tls.Verify          On
         {{- if or .Values.fluentbit.caCertificateSecret .Values.opensearch.externalOpensearch.disabled }}