KM03207448 Upgrading Elasticsearch from version 2.x to 5.x (Linux) Summary Elasticsearch is a required component of ALM Octane. This document is provided as a service and provides instructions on upgrading Elasticsearch on Red Hat Enterprise Linux / Centos platforms. Topic This article provides the steps for upgrading the Elasticsearch database from version 2.x to 5.x. Elasticsearch is a required database component for ALM Octane. Elasticsearch version 5.x is required for ALM Octane 12.55.25 and later. Overview The upgrade is divided into three stages: Before upgrading: Install the migration plugin and run the cluster checkup to see what you will need to adjust during the upgrade. Upgrade : Perform the upgrade. After upgrading : Restart the cluster, and resume indexing and searching. Before upgrading 1. Install the migration plugin: Install the migration plugin with a version corresponding to the version of Elasticsearch currently installed