Fix workaround steps

Author: kilfoyle

docs/en/ingest-management/release-notes/release-notes-8.12.asciidoc

@@ -458,35 +458,62 @@ Note that according to our <<agent-policy-scaling-recommendations,policy scaling
 
 An issue discovered in {fleet-server} prevents {agents} that have been upgraded to version 8.12.0 from being upgraded again, using the {fleet} UI, to version 8.12.1 or higher.
 
+This issue is planned to be fixed in versions 8.12.2 and 8.13.0.
+
 *Impact* +
 
-As a workaround, we recommend you to use the {kib} {fleet} API to upgrade these agents using the `force` flag.
-
-To upgrade a single {agent}:
+As a workaround, we recommend you to use the {kib} {fleet} API to update any documents in which `upgrade_details` is either `null` or not defined. Note that these steps must be run as a superuser.
 
 [source,"shell"]
 ----
-POST kbn:/api/fleet/agents/<agent_id>/upgrade
-{
-  "version": "8.12.1",
-  "force": true
-}
+ POST _security/role/fleet_superuser
+ {
+    "indices": [
+        {
+            "names": [".fleet*",".kibana*"],
+            "privileges": ["all"],
+            "allow_restricted_indices": true
+        }
+    ]
+  }
 ----
 
-To bulk upgrade a set of {agents}:
-
 [source,"shell"]
 ----
-POST kbn:/api/fleet/agents/bulk_upgrade
-  {
-    "agents": "agent.version:8.12.0",
-    "version": "8.12.1",
-    "force": true
-  }
+POST _security/user/fleet_superuser 
+ {
+    "password": "password",
+    "roles": ["superuser", "fleet_superuser"]
+ }
 ----
 
-This issue is planned to be fixed in versions 8.12.2 and 8.13.0.
+[source,"shell"]
+----
+curl -sk -XPOST --user fleet_superuser:password -H 'content-type:application/json' \
+  -H'x-elastic-product-origin:fleet' \
+  http://localhost:9200/.fleet-agents/_update_by_query \
+  -d '{
+  "script": {
+    "source": "ctx._source.remove(\"upgrade_details\")",
+    "lang": "painless"
+  },
+  "query": {
+    "bool": {
+        "must_not": {
+          "exists": {
+            "field": "upgrade_details"
+          }
+        }
+      }
+    }
+}'
+----
 
+[source,"shell"]
+----
+DELETE _security/user/fleet_superuser
+DELETE _security/role/fleet_superuser
+----
 ====
 
 [discrete]