mongodb - Spring boot / mongo wont create index with the index annotation

Question

I have the following:

@Document(collection = "linkmetadata")
public class LinkMetaData {
@Indexed(unique = true)
private String url;
...
}

But whenever it creates the collection it doesn't create any index for the url field, it's like it just ignores the annotation. Any idea why this is?

Edit: no index is created upon insertion of data either. And when I try to fetch data for a specific url it throws an error that the url key is not unique if I entered the same url twice, but it doesn't care about inserting the unique key since there is no index..

Answer 1

use auto-index-creation: true in your application properties.Add billow line in your application.properties

spring.data.mongodb.auto-index-creation: true