Restart API: Allow to restart one or more nodes

[kimchy]

The REST API follows the same rules as the shutdown API, simply replace shutdown with restart: /_cluster/nodes/{nodeId}/_restart, where {nodeId} can be a list of node ids, _all, or _local.

With the new service wrapper, if a restart is requested and the process is running using the service wrapper, a full restart of the JVM will be issued.

[kimchy]

Restart API: Allow to restart one or more nodes, closed by ebded19.

[KimStebel]

This feature does not seem to be documented anywhere.

[dadoonet]

@kimchy I tried the _restart API but without using a service wrapper and I get the following message:

$ curl -XPOST 'http://localhost:9200/_cluster/nodes/_local/_restart'

{"error":"ElasticSearchIllegalStateException[restart is disabled (for now) ....]","status":500}

Does it mean that we can only use it with the service wrapper?
I'm on the way of creating the pull request to update the documentation so I need to understand if it's a windows restriction, a configuration restriction (but I can't see an option in the elasticsearch.yml file, or something else...

Thanks for your help

cc @KimStebel

[btiernay]

See #265