Elasticsearch can usually be upgraded using a Rolling upgrade process so upgrading does not interrupt service. However, you might need to Reindex to upgrade indices created in older versions. Upgrades across major versions prior to 6.0 require a Full cluster restart.
When upgrading to a new version of Elasticsearch, you need to upgrade each of the products in your Elastic Stack. The steps you need to take to upgrade differ depending on which products you are using.
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