Exception indexing topic metadata on EAC

2014-09-02 16:42:51,674 ERROR [scheduler_Worker-4] [atlassian.bonnie.search.BaseDocumentBuilder] extractWithLuceneExtractors Error extracting search fields from [com.atlassian.confluence.plugins.confluence-questions:topic-metadata] custom: workflow v.1 (2197110673) using BackwardsCompatibleExtractor wrapping com.atlassian.confluence.search.lucene.extractor.EntityDateExtractor@680f24d6 (confluence.extractors.core:objectDateExtractor): null
java.lang.NullPointerException
	at org.apache.lucene.document.DateTools.dateToString(DateTools.java:87)
	at com.atlassian.bonnie.LuceneUtils.dateToString(LuceneUtils.java:32)
	at com.atlassian.confluence.search.lucene.extractor.EntityDateExtractor.addFields(EntityDateExtractor.java:22)
	at com.atlassian.confluence.plugin.descriptor.ExtractorModuleDescriptor$BackwardsCompatibleExtractor.addFields(ExtractorModuleDescriptor.java:43)
	at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.extractWithLuceneExtractors(ConfluenceDocumentBuilder.java:155)
	at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.getDocument(ConfluenceDocumentBuilder.java:102)
	at com.atlassian.confluence.search.lucene.tasks.AddDocumentIndexTask.perform(AddDocumentIndexTask.java:49)
	at com.atlassian.confluence.search.lucene.tasks.UpdateDocumentIndexTask.perform(UpdateDocumentIndexTask.java:43)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager$IndexTaskWriter.apply(DefaultConfluenceIndexManager.java:485)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager$IndexTaskWriter.apply(DefaultConfluenceIndexManager.java:469)
	at com.atlassian.confluence.search.lucene.queue.JournalIndexTaskQueue$4.apply(JournalIndexTaskQueue.java:195)
	at com.atlassian.confluence.search.lucene.queue.JournalIndexTaskQueue$4.apply(JournalIndexTaskQueue.java:186)
	at com.atlassian.confluence.impl.journal.DefaultJournalService$1.apply(DefaultJournalService.java:117)
	at com.atlassian.confluence.impl.journal.DefaultJournalService$1.apply(DefaultJournalService.java:113)
	at com.atlassian.confluence.impl.journal.DefaultJournalManager.processEntries(DefaultJournalManager.java:98)
	at com.atlassian.confluence.impl.journal.DefaultJournalService.processEntries(DefaultJournalService.java:52)
	at com.atlassian.confluence.search.lucene.queue.JournalIndexTaskQueue.flushQueue(JournalIndexTaskQueue.java:184)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager$BatchUpdateAction$1.perform(DefaultConfluenceIndexManager.java:449)
	at com.atlassian.bonnie.LuceneConnection.withWriter(LuceneConnection.java:499)
	at com.atlassian.confluence.search.lucene.tasks.LuceneConnectionBackedIndexTaskPerformer.perform(LuceneConnectionBackedIndexTaskPerformer.java:21)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager$BatchUpdateAction.perform(DefaultConfluenceIndexManager.java:434)
	at com.atlassian.bonnie.LuceneConnection.withBatchUpdate(LuceneConnection.java:532)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.processTasks(DefaultConfluenceIndexManager.java:199)
	at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.flushQueue(DefaultConfluenceIndexManager.java:144)
	at sun.reflect.GeneratedMethodAccessor385.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
	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 com.sun.proxy.$Proxy84.flushQueue(Unknown Source)
	at com.atlassian.confluence.search.lucene.IndexQueueFlusher.executeJob(IndexQueueFlusher.java:32)
	at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.surroundJobExecutionWithLogging(AbstractClusterAwareQuartzJobBean.java:65)
	at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.executeInternal(AbstractClusterAwareQuartzJobBean.java:47)
	at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
	at com.atlassian.scheduler.quartz1.Quartz1JobFactory$ClassLoaderProtectingWrappedJob.execute(Quartz1JobFactory.java:62)
	at org.quartz.core.JobRunShell.run(JobRunShell.java:223)
	at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool$1.run(ConfluenceQuartzThreadPool.java:22)
	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)