Recently, we talked a lot about how to scale Elasticsearch clusters and some general guidelines to follow while going into production. In this section, we are going to talk about two new APIs introduced in Elasticsearch 5.0. The Shrink and Rollover APIs. Both of these APIs are specially designed for managing time series-based indices such as, daily-/weekly-/monthly-created indices for logs, or an index for each week or month of tweets.
We know these basic points related to shards of an index: