Function refresh_source 

pub async fn refresh_source<S, I>(
    storage: &S,
    fetcher: &Fetcher,
    alias: &str,
    metrics: PerformanceMetrics,
    indexer: &I,
    filter_preference: bool,
) -> Result<RefreshOutcome>
where
    S: RefreshStorage + Sync,
    I: RefreshIndexer + Sync,

Refresh a source using its current metadata.