Convert AWS ELB logs to CSV.
pwd
# /tmp/AWSLogs/xxxxxxxxxxxx/elasticloadbalancing/xx-xxxxxxxxx-x
aws s3 cp s3://xxxxxxxx/AWSLogs/xxxxxxxxxxxx/elasticloadbalancing/xx-xxxxxxxxx-x . --recursive
elblogs-to-csv extract
elblogs-to-csv convert
elblogs-to-csv concat > /tmp/concat-logs.csv