[elasticsearch]safely reload configuration from elasticsearch.yml

在設定好 elasticsearch 的  elasticsearch.yml 後，如何安全的重新 reload 新的config呢?

目前唯一的reload config的方式就是 restart service。
所以，如果想達成沒有donwtime的cluster service，在restart前可以先使用 api check一下每個node service的status，在確保每個shard都已經存在另外的node上了，在逐步重開node。

http://esnode:9200/_cluster/health

cat health
http://www.elasticsearch.org/guide/en/elasticsearch/reference/master/cat-health.html

cf.
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