elasticsearch创建索引抛异常"error":{"type":"null_pointer_exception","reason":null}

出错

• es集群，3个节点
• 创建索引报错，空指针异常null_pointer_exception
• 只有1个节点时正常，新增两个节点后报错
• java程序调用elasticsearch批量更新方法返回信息：

{
     "index":{
     "_index":"cz_govb","_type":"160686340","_id":"205854415","status":500,"error":{
     "type":"null_pointer_exception","reason":null}}}

• elasticsearch日志打印：

[2020-02-21T17:07:55,464][WARN ][o.e.a.b.TransportShardBulkAction] [node-1-master-003-9200] [[cz_gova][1]] failed to perform indices:data/write/bulk[s] on replica [cz_gova][1], node[OgETR1vZQwKcWOazjGj7XA], [R], s[STARTED], a[id=2jdIAqwjTeuHbZZa-8QU6A]
org.elasticsearch.transport.RemoteTransportException: [node-2-master-105-9200][10.150.8.105:9300][indices:data/write/bulk[s][r]]
Caused by: java.lang.NullPointerException
	at org.wltea.analyzer.dic.Dictionary.isStopWord(Dictionary.java:334) ~[?:?]
	at org.wltea.analyzer.core.AnalyzeContext.getNextLexeme(AnalyzeContext.java:316) ~[?:?]
	at org.wltea.analyzer.core.IKSegmenter.next(IKSegmenter.java:95) ~[?:?]
	at org.wltea.analyzer.lucene.IKTokenizer.incrementToken(IKTokenizer.java:88) ~[?:?]
	at org.apache.lucene.index.DefaultIndexingChain$PerField.invert(DefaultIndexingChain.java:746) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46]
	at org.apache.lucene.index.DefaultIndexingChain.processField(DefaultIndexingChain.java:447) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46]
	at org.apache.lucene.index.DefaultIndexingChain.processDocument(DefaultIndexingChain.java:403) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46]
	at org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:232) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46]
	at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:478) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46]
	at org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1571) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46]
	at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1316) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46]
	at org.elasticsearch.index.engine.InternalEngine.index(InternalEngine.java:663) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.index.engine.InternalEngine.indexIntoLucene(InternalEngine.java:607) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.index.engine.InternalEngine.index(InternalEngine.java:505) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.index.shard.IndexShard.index(IndexShard.java:556) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.index.shard.IndexShard.index(IndexShard.java:545) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.executeIndexRequestOnReplica(TransportShardBulkAction.java:441) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnReplica(TransportShardBulkAction.java:376) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnReplica(TransportShardBulkAction.java:69) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncReplicaAction.onResponse(TransportReplicationAction.java:494) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncReplicaAction.onResponse(TransportReplicationAction.java:467) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.index.shard.IndexShardOperationsLock.acquire(IndexShardOperationsLock.java:151) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.index.shard.IndexShard.acquireReplicaOperationLock(IndexShard.java:1673) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncReplicaAction.doRun(TransportReplicationAction.java:566) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$ReplicaOperationTransportHandler.messageReceived(TransportReplicationAction.java:451) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$ReplicaOperationTransportHandler.messageReceived(TransportReplicationAction.java:441) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:69) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.transport.TcpTransport$RequestHandler.doRun(TcpTransport.java:1544) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:638) ~[elasticsearch-5.5.2.jar:5.5.2]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-5.5.2.jar:5.5.2]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_161]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_161]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]

原因

• 根据接口返回信息，只能看到空指针异常，看不到具体报错信息，必须查看其它日志信息
• 查看了es日志，发现创建索引使用分词器报的错（IKTokenizer.incrementToken）
• 使用 ./bin/elasticsearch-plugin list命令，发现插件已正常安装，继续排错
• 又仔细看了es日志，发现是分词器文件问题（NullPointerException: null at org.wltea.analyzer.dic.Dictionary.isStopWord(Dictionary.java:334)）初步怀疑缺少dic文件
• 查看了下，发现确实少了一个文件夹。新来的运维不熟悉elasticsearch，安装分词器插件时，是从第一个节点拷贝的，又没有拷贝完全，遗漏了一个文件夹

解决

• 关闭es节点1，把config下的文件夹复制出来，放到节点2,3对应位置，重启生效