_class attribute in Spring data MongoDB_

Spring data MongoDB adds a _class attribute to every document written to MongoDB

If we want to prvent adding Spring Data MongoDB from adding _class attribute, we can configure this behaviour through:

@Configuration
public class MongoConfig extends AbstractMongoClientConfiguration {
    @Override
    protected boolean autoIndexCreation() {
        return true;
    }
    
    @Bean
    public MappingMongoConverter mappingMongoConverter(MongoDatabaseFactory databaseFactory, MongoMappingContext mappingContext) {
        DbRefResolver dbRefResolver = new DefaultDbRefResolver(databaseFactory);
        MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mappingContext);
        converter.setTypeMapper(new DefaultMongoTypeMapper(null));
        return converter;
    }
}