Running multiple crawlers on different machines ingesting to different nodes on the same cluster

[ScottCov]

I have several servers and was planning on running a single instance of fscrawler on several of them and just had a few questions:

1)Why am I getting "job_name_folder" as an index in addition to all my indices?
2)Should I set up nodes on machines with fscrawler as ingest nodes or data nodes?
3)Are there any potential problems as far as fscrawlers on different machines sending docs at the same time?