Removing existing uniqueness constraint

I have a collection, and I added an index for that collection with unique: true, I deleted the index, then I tried creating documents in that collection but I still got the instance not unique even though I have already deleted the index that previously added that constraint.

Are you still getting instance not unique errors, now that it’s about a day later? If it did start working, do you have an idea how long it took for it to take effect?

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I tried for 5 to 10 minutes because I thought that it’s just taking a while to update, but I found that really odd because the collection has 2 documents in it. It still didn’t work so I simply decided to delete the collection and recreate it together with the indexes, that’s when it worked.