# Elasticsearch Upgarde (Ubuntu) This article provides detailed instructions for upgrading Elasticsearch to the latest stable version on an Ubuntu system using the APT package manager. It ensures a smooth upgrade while preserving the existing configuration and data. ### **Prerequisites** * User performing the upgrade has **sudo (administrative) privileges**. * Elasticsearch is already installed on the system. * Credentials for the **elastic** user are available (if security is enabled). * System has **internet connectivity** to fetch updated packages from the repository. ## **Upgrade Steps** * **Check the Current Version** * Run the following command to verify the installed Elasticsearch version: ```bash curl -XGET -u elastic: http://localhost:9200 ``` * Replace `` with the actual password of the **elastic** user.

* **Stop the Elasticsearch Service** * Prevent data corruption by stopping the service before upgrading:
```bash sudo systemctl stop elasticsearch ```

* **Upgrade Elasticsearch via APT** * Update repositories and install the latest version: ```bash sudo apt update sudo apt install elasticsearch -y ```

* This fetches the latest version from the configured Elastic APT repository. * **Start the Elasticsearch Service** * Restart the service after installation: ```bash sudo systemctl start elasticsearch ``` * **Verify the Upgrade** * Confirm the installed version: ```bash curl -XGET -u elastic: http://localhost:9200 ``` * The response should show the **upgraded version number**. ## **Post-Upgrade Verification (Optional)** * Check Elasticsearch logs for warnings or errors: ```bash sudo journalctl -u elasticsearch ``` * Confirm the updated version with the API: ```bash curl -XGET -u elastic: http://localhost:9200 ```