Updated with more details (11/3/2015)
Hi, according to this post by Eric Gaumer, dated two years ago, to increase CPU utilization one needs to increase the number of shards. I wonder if it is now possible to use all 32 cores on an AWS c3.8xlarge for indexing while keeping only one shard per node.
- With one shard, I can get to about 33% CPU usage (~12 cores).
- With three shards, I can get to about 60% CPU usage (~18 cores).