Concept
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Cross Region Replication (CRR) is a feature of S3 that can be activated at Bucket level by adding a replication configuration to the source bucket. A bucket’s automatic replication is specific to a Region and it is not Global. With CRR, automatic data replication can be setup across regions.
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S3 Security is divided in four categories- Privacy, Log Trail, Access Permissions and Encryption.
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IAM allow Admins to manage users and their level of access to AWS resources. IAM gives centralized access to manage permissions. IAM can act on Users and Groups, can create or use Policy documents and define Roles.
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In an elastic cluster, there are many entities that makes up a functioning cluster. Nodes, Primary Shards and Replicas are the ones frequently getting referred in documentation and articles.
Vipul Pathak 