Support ElasticSearch's -f flag
Created by: oz
ElasticSearch can be run with the -f flag, which keeps the process running in the foreground. It would be nice if I could have a way to pass it from desi start, or another command-line switch...
It is very handy to have start an ES process from e.g. foreman, which expects the process started in a Procfile to remain in the front.