Details Regarding Bakup and Restore in ElasticSearch

Good Morning All,
I need to know the details regarding snapshotting in elasticsearch.Now I'm using Elasticsearch 1.7.2 and i have taken snapshot based on the elasticsearch definitive guide.

My question is if I want to take snapshot of same index if different snapshot name it will update the previously taken index or again it will create new one, i.e by default it is performing incremental backup or not.
Thanks in advance looking forward for your reply.

Have a look at this thread: Incremental Snapshot / Restore