diff --git a/public/pages/DefineDetector/components/CustomResultIndex/CustomResultIndex.tsx b/public/pages/DefineDetector/components/CustomResultIndex/CustomResultIndex.tsx
index 24ab61cb..c6d61181 100644
--- a/public/pages/DefineDetector/components/CustomResultIndex/CustomResultIndex.tsx
+++ b/public/pages/DefineDetector/components/CustomResultIndex/CustomResultIndex.tsx
@@ -48,6 +48,7 @@ interface CustomResultIndexProps {
 function CustomResultIndex(props: CustomResultIndexProps) {
   const [enabled, setEnabled] = useState<boolean>(!!props.resultIndex);
   const [customResultIndexConditionsEnabled, setCustomResultIndexConditionsEnabled] = useState<boolean>(true);
+  const [isDisabled, setIsDisabled] = useState(false);
   const customResultIndexMinAge = get(props.formikProps, 'values.resultIndexMinAge');
   const customResultIndexMinSize = get(props.formikProps, 'values.resultIndexMinSize');
   const customResultIndexTTL = get(props.formikProps, 'values.resultIndexTtl');
@@ -66,6 +67,14 @@ function CustomResultIndex(props: CustomResultIndexProps) {
     }
   },[customResultIndexConditionsEnabled])
 
+  useEffect(() => {
+    if (props.isEdit && !get(props.formikProps, 'values.flattenCustomResultIndex')) {
+      setIsDisabled(true);
+    } else {
+      setIsDisabled(false);
+    }
+  }, [props.isEdit]);
+
   const hintTextStyle = {
     color: '#69707d',
     fontSize: '12px',
@@ -162,6 +171,7 @@ function CustomResultIndex(props: CustomResultIndexProps) {
                     id={'flattenCustomResultIndex'}
                     label="Enable flattened custom result index"
                     checked={field.value ? field.value : get(props.formikProps, 'values.flattenCustomResultIndex')}
+                    disabled={isDisabled}
                     {...field}
                   />
                   <p style={hintTextStyle}>Flattening the custom result index will make it easier to query them on the dashboard. It also allows you to perform term aggregations on categorical fields.</p>