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Update node.asciidoc 

Master nodes must have access to a persistent data directory
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Clinton Gormley 2016-07-17 21:10:33 +02:00 committed by GitHub
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docs/reference/modules/node.asciidoc
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@ -82,6 +82,9 @@ cluster health to have a stable master node.
Any master-eligible node (all nodes by default) may be elected to become the
master node by the <<modules-discovery-zen,master election process>>.
IMPORTANT: Master nodes must still access to the `data/` directory (just like
`data` nodes) as this is where the cluster state is persisted between node restarts.
Indexing and searching your data is CPU-, memory-, and I/O-intensive work
which can put pressure on a node's resources. To ensure that your master
node is stable and not under pressure, it is a good idea in a bigger