Job (DEFAULT.IndexQueueFlusher threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: com.atlassian.bonnie.LuceneException: com.atlassian.bonnie.LuceneException: Couldn't open writer on directory: org.apache.lucene.store.SimpleFSDirectory@D:\confluence-home\index lockFactory=org.apache.lucene.store.SimpleFSLockFactory@1630667]
	at org.quartz.core.JobRunShell.run(JobRunShell.java:210)
	at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool$1.run(ConfluenceQuartzThreadPool.java:14)
	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)
Caused by: com.atlassian.bonnie.LuceneException: com.atlassian.bonnie.LuceneException: Couldn't open writer on directory: org.apache.lucene.store.SimpleFSDirectory@D:\confluence-home\index lockFactory=org.apache.lucene.store.SimpleFSLockFactory@1630667
	at com.atlassian.bonnie.LuceneConnection.withBatchUpdate(LuceneConnection.java:409)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.processTasks(DefaultConfluenceIndexManager.java:161)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.flushQueue(DefaultConfluenceIndexManager.java:128)
	at sun.reflect.GeneratedMethodAccessor826.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy39.flushQueue(Unknown Source)
	at com.atlassian.confluence.search.lucene.IndexQueueFlusher.executeJob(IndexQueueFlusher.java:29)
	at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.surroundJobExecutionWithLogging(AbstractClusterAwareQuartzJobBean.java:63)
	at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.executeInternal(AbstractClusterAwareQuartzJobBean.java:46)
	at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
	at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
	... 2 more
Caused by: com.atlassian.bonnie.LuceneException: Couldn't open writer on directory: org.apache.lucene.store.SimpleFSDirectory@D:\confluence-home\index lockFactory=org.apache.lucene.store.SimpleFSLockFactory@1630667
	at com.atlassian.bonnie.LuceneConnection.withWriter(LuceneConnection.java:346)
	at com.atlassian.confluence.search.lucene.tasks.LuceneConnectionBackedIndexTaskPerformer.perform(LuceneConnectionBackedIndexTaskPerformer.java:20)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager$BatchUpdateAction.perform(DefaultConfluenceIndexManager.java:361)
	at com.atlassian.bonnie.LuceneConnection.withBatchUpdate(LuceneConnection.java:405)
	... 19 more
Caused by: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: SimpleFSLock@D:\confluence-home\index\write.lock
	at org.apache.lucene.store.Lock.obtain(Lock.java:85)
	at org.apache.lucene.index.IndexWriter.init(IndexWriter.java:1562)
	at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1118)
	at com.atlassian.bonnie.LuceneConnection.withWriter(LuceneConnection.java:327)
	... 22 more