Went from ES and sharding hell to less of a sharding hell with OS on AWS. I've been looking for a replacement ever since first friday evening sharding party with infrastructure team.
yeah, you haven't lived until you curled in blind rage _cluster/allocation/explain and _cat/shards?h=index,shard,prirep,state,unassigned.reason | grep UNASSIGNED every few seconds; In production party, with tarantulas on your back asking for status, of course.
Man, that made me laugh. I'm using that.