|  | @@ -16,6 +16,10 @@ Plugins contain JAR files, but may also contain scripts and config files, and
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				|  |  |  must be installed on every node in the cluster. After installation, each
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				|  |  |  node must be restarted before the plugin becomes visible.
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				|  |  |  
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				|  |  | +NOTE: A full cluster restart is required for installing plugins that have
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				|  |  | +custom cluster state metadata, such as X-Pack. It is still possible to upgrade
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				|  |  | +such plugins with a rolling restart.
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				|  |  | +
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				|  |  |  This documentation distinguishes two categories of plugins:
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				|  |  |  
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				|  |  |  Core Plugins::    This category identifies plugins that are part of Elasticsearch
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