The indexed blog posts have incorrect links for the different language versions. Links for blog posts translated in non-default languages have a link in the default language.

public class ContentInboundPipeCustom : ContentInboundPipe
{
    protected override void SetProperties(WrapperObject wrapperObject, IContent contentItem)
    {
        base.SetProperties(wrapperObject, contentItem);

        if (contentItem.GetType().FullName == "Telerik.Sitefinity.Blogs.Model.BlogPost")
        {
            var culture = new CultureInfo(wrapperObject.Language);

            using (new CultureRegion(culture))
            {
                var itemUrl = base.GetItemUrl(contentItem);

                if (!String.IsNullOrEmpty(itemUrl))
                {
                    wrapperObject.SetOrAddProperty(PublishingConstants.FieldLink, itemUrl);
                }
            }
        }
    }
}

protected void Application_Start(object sender, EventArgs e)
{
    Bootstrapper.Initialized += OnBootstrapperInitialized;
}

private static void OnBootstrapperInitialized(object sender, ExecutedEventArgs e)
{
    if (e.CommandName == "Bootstrapped")
    {
        PublishingSystemFactory.UnregisterPipe(ContentInboundPipe.PipeName);
        PublishingSystemFactory.RegisterPipe(ContentInboundPipe.PipeName, typeof(ContentInboundPipeCustom));
    }
}