fix(indexer): tell admins when ingress routes search to wrong pod (#9274)

* [ee] fix(indexer): tell admins when ingress routes search to wrong pod

When the IndexReader is absent on the pod handling a search request but
another pod is actively holding the indexer lock, the EE handler now
returns a tailored error pointing at the ingress/load-balancer
configuration instead of the generic "indexer not running" message.

The indexer status endpoint reads the DB lock so it reports "running"
from any pod, but search endpoints need the in-memory IndexReader that
only exists on the lock holder. In multi-replica deployments this looks
like the indexer is healthy but every search 404s.

Companion: windmill-labs/windmill-ee-private#TBD

Fixes WIN-1968.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* chore: update ee-repo-ref to eb18d7b4c0e37fea3f6e1e2cc44e0fddd74ff817

This commit updates the EE repository reference after PR #586 was merged in windmill-ee-private.

Previous ee-repo-ref: 7dd43d1850813071cc18ba49ba090583e7321f4b

New ee-repo-ref: eb18d7b4c0e37fea3f6e1e2cc44e0fddd74ff817

Automated by sync-ee-ref workflow.

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: windmill-internal-app[bot] <windmill-internal-app[bot]@users.noreply.github.com>

backend/.sqlx/query-9b88e522ecbe9fa67ef83e79ec5eb5c9c87999a877fcb7f23be75d991bba6e49.json

@@ -0,0 +1,22 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT last_locked_at FROM concurrency_locks WHERE id = $1",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "last_locked_at",
+        "type_info": "Timestamp"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Text"
+      ]
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "9b88e522ecbe9fa67ef83e79ec5eb5c9c87999a877fcb7f23be75d991bba6e49"
+}

backend/ee-repo-ref.txt

@@ -1 +1 @@
-daffe7bb81cfcaca666c61de1ee838a44d60ebc2
+eb18d7b4c0e37fea3f6e1e2cc44e0fddd74ff817