From a4fa86deed2c760b16f6f78a90873f55408f886c Mon Sep 17 00:00:00 2001
From: Jakob Ackermann <jakob.ackermann@overleaf.com>
Date: Thu, 30 Jun 2022 10:27:32 +0100
Subject: [PATCH] Merge pull request #8542 from
 overleaf/jlm-drop-index-if-exists

Do not fail to drop non-existent indexes

GitOrigin-RevId: 226eba50a395f62751028e22030a53a0487f5343
---
 services/web/migrations/lib/helpers.js | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/services/web/migrations/lib/helpers.js b/services/web/migrations/lib/helpers.js
index 8be0393ec2..7a79ab9a8a 100644
--- a/services/web/migrations/lib/helpers.js
+++ b/services/web/migrations/lib/helpers.js
@@ -15,7 +15,19 @@ async function addIndexesToCollection(collection, indexes) {
 }
 
 async function dropIndexesFromCollection(collection, indexes) {
-  return Promise.all(indexes.map(index => collection.dropIndex(index.name)))
+  return Promise.all(
+    indexes.map(async index => {
+      try {
+        await collection.dropIndex(index.name)
+      } catch (err) {
+        if (err.code === 27 /* IndexNotFound */) {
+          console.log(`Index ${index.name} not found; drop was a no-op.`)
+        } else {
+          throw err
+        }
+      }
+    })
+  )
 }
 
 async function dropCollection(collectionName) {