diff --git a/core/modules/field/config/schema/field.schema.yml b/core/modules/field/config/schema/field.schema.yml
index 788f3a0..caa4718 100644
--- a/core/modules/field/config/schema/field.schema.yml
+++ b/core/modules/field/config/schema/field.schema.yml
@@ -45,8 +45,8 @@ field.field.*.*:
         - type: sequence
           label: 'Indexes'
           sequence:
-            - type: string
-              label: 'Column'
+            - type: ignore
+              label: 'Index'
 
 field.instance.*.*.*:
   type: config_entity