搜寻结果中的状态为503

Question

这样做的时候：

curl -X GET 'http://localhost:9200' 

我明白了，elascticsearch的状态是503。 请帮助我纠正该问题。

{
   "status" : 503,
   "name" : "My First Node",
   "cluster_name" : "mycluster1",
   "version" : {
       "number" : "1.7.3",
       "build_hash" : "05d4530971ef0ea46d0f4fa6ee64dbc8df659682",
       "build_timestamp" : "2015-10-15T09:14:17Z",
       "build_snapshot" : false,
       "lucene_version" : "4.10.4"
},
   "tagline" : "You Know, for Search"
}