diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_settings.json b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_settings.json
index 7c9cf627530ef..97131b1e80086 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_settings.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_settings.json
@@ -34,10 +34,10 @@
           "default": "open",
           "description": "Whether to expand wildcard expression to concrete indices that are open, closed or both."
         },
-          "flat_settings": {
-              "type": "boolean",
-              "description": "Return settings in flat format (default: false)"
-          }
+        "flat_settings": {
+          "type": "boolean",
+          "description": "Return settings in flat format (default: false)"
+        }
       }
     },
     "body": {