[bug 1071567] Update ElasticUtils to 0.10.1

This updates ElasticUtils to 0.10.1 which will work with Elasticsearch
1.2. This needs to land before we can upgrade the cluster else the world
will end (and catch everyone completely offguard).
Merge pull request #350 from willkg/update-elasticutils

Update ElasticUtils to 0.10.1