From aac47a1aeec781b29f1f5d2b3178263ad6150ab9 Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Mon, 18 Jun 2018 15:16:07 +0200
Subject: [PATCH] fix(db): throw readable error when creating `_id` with
 background: true

---
 lib/db.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/db.js b/lib/db.js
index 937efcd635..1e59ee3eeb 100644
--- a/lib/db.js
+++ b/lib/db.js
@@ -1042,6 +1042,7 @@ var createIndex = function(self, name, fieldOrSpec, options, callback) {
     // 86 = 'IndexKeySpecsConflict' (index already exists with the same name)
     // 11000 = 'DuplicateKey' (couldn't build unique index because of dupes)
     // 11600 = 'InterruptedAtShutdown' (interrupted at shutdown)
+    // 197 = 'InvalidIndexSpecificationOption' (`_id` with `background: true`)
     // These errors mean that the server recognized `createIndex` as a command
     // and so we don't need to fallback to an insert.
     if (
@@ -1049,7 +1050,8 @@ var createIndex = function(self, name, fieldOrSpec, options, callback) {
       err.code === 11000 ||
       err.code === 85 ||
       err.code === 86 ||
-      err.code === 11600
+      err.code === 11600 ||
+      err.code === 197
     ) {
       return handleCallback(callback, err, result);
     }