[DOCS] Removed redundant (not quite right) information about upgrades.

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Deb Adair 2019-04-02 16:01:51 -07:00
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[partintro]
--
This section discusses the changes that you need to be aware of when migrating
your application from one version of Elasticsearch to another.
This section discusses the changes that you need to be aware of to migrate
your application to {version}. For more information about what's new in this
release, see the <<release-highlights>> and <<es-release-notes>>.
As a general rule:
* Migration between minor versions -- e.g. `7.x` to `7.y` -- can be
performed by <<rolling-upgrades,upgrading one node at a time>>.
* Migration between consecutive major versions -- e.g. `6.x` to `7.x` --
requires a <<restart-upgrade,full cluster restart>>.
* Migration between non-consecutive major versions -- e.g. `5.x` to `7.x` --
is not supported.
For more information, see <<setup-upgrade>>.
See also <<release-highlights>> and <<es-release-notes>>.
For information about how to upgrade your cluster, see <<setup-upgrade>>.
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