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This is very similar to insert when possible" class="issue-link" data-issue-key="SERVER-14322">SERVER-14322 however I'm in a case where the auto retry should happen from what I understand but it does not. Error: E11000 duplicate key error collection: dbName.collectionName index: a_1_b_1 dup key: { a: 31910, b: "2021-09-02T00:00:00Z" } Indexes > db.collectionName.getIndexes() [ { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_", "ns" : "databaseName.collectionName" }, { "v" : 2, "unique" : true, "key" : { "a" : 1, "b" : 1 }, "name" : "a_1_b_1", "ns" : "databaseName.collectionName", "sparse" : true } ] Commands run (though ReactiveMongo Scala): > db.collectionName.findAndModify( query: { a: 31910, b: "2021-09-02T00:00:00Z" }, update: { $inc: { c: 1 } }, new: true upsert: true ) In our use case, 8 commands are sent at the same time and sometimes we get 1 such error (not always). Current document matching: > db.collectionName.find({a:31910, b: "2021-09-02T00:00:00Z"}) { "_id" : ObjectId("613062a3a00a6ac1f7687e5e"), "b" : "2021-09-02T00:00:00Z", "a" : 31910, "c" : 389723 } Is this expected? Am I missing something? We can add some retry mechanism in our code but I'd like to understand why the auto retry does not work. Any comment will be appreciated.

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JIRAUSER1257066 commented on Wed, 29 Sep 2021 15:09:50 +0000: Hi gjourdanweil@gmail.com, Thanks for following up! Given that we've discussed that this a risky backport, I will close this as a duplicate of SERVER-47212 based on the discussion you had with james.wahlin on insert when possible" class="issue-link" data-issue-key="SERVER-14322">SERVER-14322. Best, Edwin JIRAUSER1262197 commented on Tue, 28 Sep 2021 07:28:13 +0000: From https://jira.mongodb.org/browse/SERVER-14322?focusedCommentId=4087196&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-4087196: SERVER-47212 tracks this issue for the findAndModify command. The fix is currently available in MongoDB 5.0, but was deemed as risky to backport to 4.4 or earlier.

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