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在使用elasticsearch-rtf 2.2.0版本时使用analyze命令测试配置的自定义分词器是否生效，结果运行后日志报错，我测试的url命令如下：

http://10.0.18.123:9200/_analyze?text=中文测试&analyzer=ik_syno

[ERROR][transport                ] [Cassiopea] failed to handle exception for action [indices:admin/analyze[s]], handler [org.elasticsearch.action.support.single.shard.TransportSingleShar[email protected]
]

java.lang.NullPointerException

	at org.elasticsearch.action.support.single.shard.TransportSingleShardAction$AsyncSingleAction.perform(TransportSingleShardAction.java:195)

	at org.elasticsearch.action.support.single.shard.TransportSingleShardAction$AsyncSingleAction.access$700(TransportSingleShardAction.java:115)

	at org.elasticsearch.action.support.single.shard.TransportSingleShardAction$AsyncSingleAction$1.handleException(TransportSingleShardAction.java:174)

	at org.elasticsearch.transport.TransportService$DirectResponseChannel.processException(TransportService.java:821)

	at org.elasticsearch.transport.TransportService$DirectResponseChannel.sendResponse(TransportService.java:799)

	at org.elasticsearch.transport.TransportService$4.onFailure(TransportService.java:361)

	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:39)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

	at java.lang.Thread.run(Thread.java:745)

查询google得知为最新的bug一枚，https://github.com/elastic/elasticsearch/pull/15447 ，做个记号。测试的时候需要在设置的索引上运行analyze来避免这个bug被触发。

http://10.0.18.123:9200/indexName/_analyze?text=中文测试&analyzer=ik_syno