Extractor module initialisation failures break indexing

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.atlassian.confluence.extra.officeconnector.index.word.WordTextExtractor': Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class com.atlassian.confluence.extra.officeconnector.index.word.WordTextExtractor
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:342)
	at sun.reflect.GeneratedMethodAccessor160.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at com.atlassian.plugin.osgi.spring.DefaultSpringContainerAccessor.createBean(DefaultSpringContainerAccessor.java:97)
	at com.atlassian.confluence.plugin.ConfluencePluginUtils.instantiatePluginModule(ConfluencePluginUtils.java:162)
	at com.atlassian.confluence.plugin.descriptor.AbstractExtractorModuleDescriptor.createModule(AbstractExtractorModuleDescriptor.java:111)
	at com.atlassian.confluence.plugin.descriptor.ExtractorModuleDescriptor.createModule(ExtractorModuleDescriptor.java:57)
	at com.atlassian.confluence.plugin.descriptor.ExtractorModuleDescriptor.createModule(ExtractorModuleDescriptor.java:12)
	at com.atlassian.confluence.plugin.module.PluginModuleHolder.createModule(PluginModuleHolder.java:78)
	at com.atlassian.confluence.plugin.module.PluginModuleHolder.getModule(PluginModuleHolder.java:104)
	at com.atlassian.confluence.plugin.descriptor.AbstractExtractorModuleDescriptor.getModule(AbstractExtractorModuleDescriptor.java:70)
	at com.atlassian.confluence.plugin.descriptor.AbstractExtractorModuleDescriptor.getModule(AbstractExtractorModuleDescriptor.java:26)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:352)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.extractWithLuceneExtractors(ConfluenceDocumentBuilder.java:175)
	at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.getDocument(ConfluenceDocumentBuilder.java:121)
	at com.atlassian.confluence.search.lucene.tasks.AddDocumentIndexTask.perform(AddDocumentIndexTask.java:55)
	at com.atlassian.confluence.search.lucene.ReindexWorkBatch.indexCollection(ReindexWorkBatch.java:140)
	at com.atlassian.confluence.search.lucene.ReindexWorkBatch.lambda$executeTransaction$227(ReindexWorkBatch.java:108)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
	at com.atlassian.confluence.search.lucene.ReindexWorkBatch.executeTransaction(ReindexWorkBatch.java:83)
	at com.atlassian.confluence.search.lucene.ReindexWorkBatch.run(ReindexWorkBatch.java:71)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at com.atlassian.confluence.tenant.TenantGate$3.call(TenantGate.java:164)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.atlassian.confluence.extra.officeconnector.index.word.WordTextExtractor
	at sun.reflect.GeneratedConstructorAccessor309.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
	... 38 more