65 lines
2.9 KiB
Plaintext
65 lines
2.9 KiB
Plaintext
[[setup-upgrade]]
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== Upgrading Elasticsearch
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[IMPORTANT]
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===========================================
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Before upgrading Elasticsearch:
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* Review the <<breaking-changes,breaking changes>> for changes that
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affect your application.
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* Check the <<deprecation-logging, deprecation log>> to see if you are using
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any deprecated features.
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* If you use custom plugins, make sure compatible versions are available.
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* Test upgrades in a dev environment before upgrading your production cluster.
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* <<modules-snapshots,Back up your data>> before upgrading.
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You **cannot roll back** to an earlier version unless you have a backup of
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your data.
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===========================================
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Elasticsearch can usually be upgraded using a <<rolling-upgrades,Rolling upgrade>>
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process so upgrading does not interrupt service. However, you might
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need to <<reindex-upgrade,Reindex to upgrade>> indices created in older versions.
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Upgrades across major versions prior to 6.0 require a <<restart-upgrade,Full cluster restart>>.
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The following table shows when you can perform a rolling upgrade, when you
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need to reindex or delete old indices, and when a full cluster restart is
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required.
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[[upgrade-paths]]
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[cols="1<m,1<m,3",options="header",]
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|=======================================================================
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|Upgrade From |Upgrade To |Supported Upgrade Type
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|5.x |5.y |<<rolling-upgrades,Rolling upgrade>> (where `y > x`)
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|5.6 |6.x |<<rolling-upgrades,Rolling upgrade>> footnoteref:[reindexfn, You must delete or reindex any indices created in 2.x before upgrading.]
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|5.0-5.5 |6.x |<<restart-upgrade,Full cluster restart>> footnoteref:[reindexfn]
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|<5.x |6.x |<<reindex-upgrade,Reindex to upgrade>>
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|6.x |6.y |<<rolling-upgrades,Rolling upgrade>> (where `y > x`) footnote:[Upgrading from a 6.0.0 pre GA version requires a full cluster restart.]
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|=======================================================================
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[IMPORTANT]
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===============================================
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Elasticsearch can read indices created in the *previous major version*.
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Older indices must be reindexed or deleted. Elasticsearch 6.x
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can use indices created in Elasticsearch 5.x, but not those created in
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Elasticsearch 2.x or before. Elasticsearch 5.x can use indices created in
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Elasticsearch 2.x, but not those created in 1.x or before.
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This also applies to indices backed up with <<modules-snapshots,snapshot
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and restore>>. If an index was originally created in 2.x, it cannot be
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restored to a 6.x cluster even if the snapshot was created by a 2.x cluster.
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Elasticsearch nodes will fail to start if incompatible indices are present.
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For information about how to upgrade old indices, see <<reindex-upgrade,
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Reindex to upgrade>>.
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===============================================
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include::upgrade/rolling_upgrade.asciidoc[]
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include::upgrade/cluster_restart.asciidoc[]
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include::upgrade/reindex_upgrade.asciidoc[] |