CI Stands for Continuous Integration and CD stands for Continous Deployment.
ZooKeeper is an application library that allows distributed processes to coordinate with each other through a shared hierarchical name space of data registers; these data registers are called as znodes.
ZooKeeper was designed to store coordination data such as status information, configuration, location information, and so on.
ZooKeeper was a sub-project of Hadoop but is now a top-level project in its own right.
With the previous notes from the current book (Amazon Elasticsearch Service) and Elasticsearch Essentials, you should have decent understanding of Elasticsearch. Next, we will try to learn Amazon ES in deep.
Following are some of the links that will help start that journey to master Amazon ES: