diff --git a/spec/namespaces/indices.yaml b/spec/namespaces/indices.yaml
index 09e149409..2b837f5c1 100644
--- a/spec/namespaces/indices.yaml
+++ b/spec/namespaces/indices.yaml
@@ -869,6 +869,8 @@ paths:
         - $ref: '#/components/parameters/indices.upgrade::query.ignore_unavailable'
         - $ref: '#/components/parameters/indices.upgrade::query.only_ancient_segments'
         - $ref: '#/components/parameters/indices.upgrade::query.wait_for_completion'
+      requestBody:
+        $ref: '#/components/requestBodies/indices.upgrade'
       responses:
         '200':
           $ref: '#/components/responses/indices.upgrade@200'
@@ -2543,7 +2545,7 @@ components:
       content:
         application/json:
           schema:
-            $ref: '../schemas/indices._common.yaml#/components/schemas/IndexUpgradeStatus'
+            $ref: '../schemas/indices._common.yaml#/components/schemas/IndexGetUpgradeStatus'
     indices.open@200:
       content:
         application/json: