Docs: Fix README upgrade mention (#32313)

The README still mentioned Elasticsearch 1.x. This commit links to the
documentation instead and properly formats the last paragraph.
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Alexander Reelsen 2018-07-31 16:14:37 +02:00 committed by GitHub
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@ -209,10 +209,6 @@ The distribution for each project will be created under the @build/distributions
See the "TESTING":TESTING.asciidoc file for more information about running the Elasticsearch test suite.
h3. Upgrading from Elasticsearch 1.x?
h3. Upgrading from older Elasticsearch versions
In order to ensure a smooth upgrade process from earlier versions of
Elasticsearch (1.x), it is required to perform a full cluster restart. Please
see the "setup reference":
https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-upgrade.html
for more details on the upgrade process.
In order to ensure a smooth upgrade process from earlier versions of Elasticsearch, please see our "upgrade documentation":https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-upgrade.html for more details on the upgrade process.