Merge pull request #152 from ascrutae/zhangxin/fix-149

fix collector cannot start issue

skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/storage/EsClient.java

@@ -28,7 +28,7 @@ public enum EsClient {
 
     public void boot() throws UnknownHostException {
         Settings settings = Settings.builder()
-            .put("cluster.NAME", EsConfig.Es.Cluster.NAME)
+            .put("cluster.name", EsConfig.Es.Cluster.NAME)
             .put("client.transport.sniff", EsConfig.Es.Cluster.Transport.SNIFFER)
             .build();