@kimchy That's interesting to hear. I had no problems with 0.90.x on my teeny-tiny cluster. I had no problems with 1.0 on the same cluster. I'm having fits with 1.1 on this same cluster. Within 10 minutes after UTC rollover, my Logstash has stopped sending data for the last several days. After a restart all is well.
There are no indicators in either log file (though I'm admittedly not in debug for Logstash, but it didn't seem to matter there).
For some reason, it just stops cold after a bit in the new index. I can't figure out why. When Logstash is sending to disk, I have no such problems. Only when I send to ES (and it doesn't matter if it's http or node or transport protocol from my testing).