Function catch_up_missing_entries 

pub fn catch_up_missing_entries<P: LogPeer + ?Sized>(
    local_last_index: LogIndex,
    local_last_hash: LogHash,
    cluster_id: &str,
    epoch: u64,
    config_id: u64,
    peer: &P,
    max_entries: u32,
) -> Result<Vec<LogEntry>, FetchLogError>