ik-1.9.3 远程热更新自定义词库报错: java.lang.NullPointerException

[tangyu]

Elasticsearch v2.3.3
elasticsearch-analysis-ik-1.9.3
热词地址参看：http://apitest.yourdream.cc/?method=search.getCustomDict

错误日志如下

[2016-06-27 08:21:08,708][INFO ][ik-analyzer ] [Dict Loading] http://xxx.xxx.xxx/?method=search.getCustomDict
[2016-06-27 08:21:08,833][INFO ][ik-analyzer ] 妖娆
...
[2016-06-27 08:21:08,971][INFO ][ik-analyzer ] 路飞
[2016-06-27 08:21:08,972][INFO ][ik-analyzer ] [Dict Loading] ik/custom/ext_stopword.dic
[2016-06-27 08:21:08,972][INFO ][ik-analyzer ] 重新加载词典完毕...
[2016-06-27 08:21:32,581][WARN ][cluster.routing.allocation.decider] [Wasp] high disk watermark [90%] exceeded on [8ZKba3nMQduNLWdLy8hFlQ][Wasp][/home/data/es2/elasticsearch/nodes/0] free: 576.2mb[7.1%], shards will be relocated away from this node
[2016-06-27 08:21:32,582][INFO ][cluster.routing.allocation.decider] [Wasp] rerouting shards: [high disk watermark exceeded on one or more nodes]
[2016-06-27 08:22:02,595][WARN ][cluster.routing.allocation.decider] [Wasp] high disk watermark [90%] exceeded on [8ZKba3nMQduNLWdLy8hFlQ][Wasp][/home/data/es2/elasticsearch/nodes/0] free: 576.2mb[7.1%], shards will be relocated away from this node
[2016-06-27 08:22:08,294][ERROR][ik-analyzer ] remote_ext_dict http://xxx.xxx.xxx/?method=search.getCustomDict error!
java.lang.NullPointerException
at org.wltea.analyzer.dic.Monitor.run(Monitor.java:72)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

[Klauszhao]

求解热更新的扩展思路，还是不太懂啊。