Elastic Cloud's integration with Azure Key Vault allows users to enhance the security of their cloud deployments by implementing encryption at rest through a "bring your own key" (BYOK) approach. This method involves creating an RSA asymmetric key within Azure Key Vault and configuring it alongside Elastic Cloud deployments to encrypt both data and snapshots. Key management features like rotation and revocation are supported, reducing the risk of data breaches and ensuring secure access control. The process requires an Enterprise subscription and involves setting up proper Azure IAM policies to grant Elastic Cloud access to the encryption keys. Additionally, users can monitor the encryption status via the Elastic Cloud Console and perform key rotations or revocations as needed to maintain security. The blog provides a detailed walkthrough of the setup, including key creation, deployment integration, and verification processes, encouraging users to try the feature with a free trial and mentioning future plans to cover encryption with GCP KMS keys.