REST : Add stats and get alert rest handlers.

Original commit: elastic/x-pack-elasticsearch@f402c13fc5

src/main/java/org/elasticsearch/alerts/transport/actions/stats/TransportAlertStatsAction.java

@@ -22,7 +22,7 @@ import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 
 /**
- * Performs the delete operation.
+ * Performs the stats operation.
  */
 public class TransportAlertStatsAction extends TransportMasterNodeOperationAction<AlertsStatsRequest, AlertsStatsResponse> {
 

src/main/java/org/elasticsearch/alerts/transport/actions/stats/package-info.java

@@ -5,6 +5,6 @@
  */
 
 /**
- * Delete action.
+ * Stats action.
  */
 package org.elasticsearch.alerts.transport.actions.stats;