Remove obsolete Shutdown API

This has been long gone!

src/Elasticsearch/Namespaces/NodesNamespace.php

@@ -108,27 +108,4 @@ public function hotThreads($params = array())
         return $this->performRequest($endpoint);
     }
 
-    /**
-     * $params['node_id'] = (list) A comma-separated list of node IDs or names to perform the operation on; use `_local` to perform the operation on the node you're connected to, leave empty to perform the operation on all nodes
-     *        ['delay']   = (time) Set the delay for the operation (default: 1s)
-     *        ['exit']    = (boolean) Exit the JVM as well (default: true)
-     *
-     * @param $params array Associative array of parameters
-     *
-     * @return array
-     */
-    public function shutdown($params = array())
-    {
-        $nodeID = $this->extractArgument($params, 'node_id');
-
-        /** @var callback $endpointBuilder */
-        $endpointBuilder = $this->endpoints;
-
-        /** @var \Elasticsearch\Endpoints\Cluster\Nodes\Shutdown $endpoint */
-        $endpoint = $endpointBuilder('Cluster\Nodes\Shutdown');
-        $endpoint->setNodeID($nodeID);
-        $endpoint->setParams($params);
-
-        return $this->performRequest($endpoint);
-    }
 }