Clean EC2 disco doc Add Azure disco doc Add Google Compute Engine doc Fix Zen doc (add `enabled` in `multicast` parameters list) - Fix #5032.
* Clean up s/ElasticSearch/Elasticsearch on docs/* * Clean up s/ElasticSearch/Elasticsearch on src/* bin/* & pom.xml * Clean up s/ElasticSearch/Elasticsearch on NOTICE.txt and README.textile Closes #4634