elasticsearch/docs/reference/upgrade.asciidoc

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[[setup-upgrade]]
= Upgrade {es}
{es} clusters can usually be upgraded one node at a time so
upgrading does not interrupt service. To upgrade to 8.0 or later,
**you must first upgrade to {prev-major-last}**, even if you opt to
do a full-cluster restart instead of a rolling upgrade.
This enables you to use the **Upgrade Assistant** to identify and resolve issues,
reindex indices created before 7.0, and then perform a rolling upgrade.
You must resolve all critical issues before proceeding with the upgrade.
For upgrade instructions, see {stack-ref}/upgrading-elastic-stack.html[Upgrading to Elastic {version}].
[discrete]
[[upgrade-index-compatibility]]
=== Index compatibility
{es} can read indices created in the previous major version. If you
have indices created in 6.x or earlier, you must reindex or delete them
before upgrading to {version}. {es} nodes will fail to start if
incompatible indices are present. Snapshots of 6.x or earlier indices cannot be
restored to a 8.x cluster even if they were created by a 7.x cluster.
The **Upgrade Assistant** in {prev-major-last} identifies any indices
that need to be reindexed or removed.
[discrete]
[[upgrade-rest-api-compatibility]]
=== REST API compatibility
REST API compatibility in a per-request opt-in feature that can help REST clients
mitigate non compatible (breaking) changes to the REST API.
See <<rest-api-compatibility>> for additional information.
[discrete]
[[upgrade-fips-java17]]
=== FIPS Compliance and Java 17
include::{xes-repo-dir}/security/fips-java17.asciidoc[]
include::upgrade/archived-settings.asciidoc[]