http://paulsabou.com/blog/2012/04/15/the-use-of-aliases-in-elasticsearch/
https://github.com/taskrabbit?page=3
http://db-engines.com/en/system/Elasticsearch%3BHBase
http://blog.mozilla.org/data/2010/12/30/flume-hive-and-realtime-indexing-via-elasticsearch-2/
http://www.cnblogs.com/MrHiFiy/archive/2012/12/06/2806228.html
http://chenlinux.com/2012/10/21/elasticearch-simple-usage/
http://www.blogjava.net/qileilove/archive/2014/02/14/409855.html
http://java.dzone.com/articles/core-elasticsearch-operations