Raised exception while starting the application. Fix the error and restart.

Message
org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/var/lib/geonetwork_data_dir/index/taxonomy/write.lock: java.nio.channels.OverlappingFileLockException
Handler
org.fao.geonet.Geonetwork
Exception
java.lang.RuntimeException: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/var/lib/geonetwork_data_dir/index/taxonomy/write.lock: java.nio.channels.OverlappingFileLockException
Stack
java.lang.RuntimeException: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/var/lib/geonetwork_data_dir/index/taxonomy/write.lock: java.nio.channels.OverlappingFileLockException
	at org.fao.geonet.kernel.search.index.LuceneIndexLanguageTracker.lazyInit(LuceneIndexLanguageTracker.java:78)
	at org.fao.geonet.kernel.search.index.LuceneIndexLanguageTracker.acquire(LuceneIndexLanguageTracker.java:167)
	at org.fao.geonet.kernel.search.SearchManager.getIndexReader(SearchManager.java:1395)
	at org.fao.geonet.kernel.search.SearchManager.getNewIndexReader(SearchManager.java:1399)
	at org.fao.geonet.kernel.search.SearchManager.getDocsChangeDate(SearchManager.java:1056)
	at org.fao.geonet.kernel.DataManager.init(DataManager.java:237)
	at org.fao.geonet.Geonetwork.start(Geonetwork.java:387)
	at jeeves.server.JeevesEngine.initAppHandler(JeevesEngine.java:452)
	at jeeves.server.JeevesEngine.init(JeevesEngine.java:173)
	at jeeves.server.sources.http.JeevesServlet.init(JeevesServlet.java:82)
	at javax.servlet.GenericServlet.init(GenericServlet.java:158)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1230)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1174)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1066)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5377)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5669)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4138)
	at org.apache.catalina.startup.HostConfig.reload(HostConfig.java:1539)
	at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1512)
	at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1748)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:333)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1370)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/var/lib/geonetwork_data_dir/index/taxonomy/write.lock: java.nio.channels.OverlappingFileLockException
	at org.apache.lucene.store.Lock.obtain(Lock.java:89)
	at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:724)
	at org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyWriter.openIndexWriter(DirectoryTaxonomyWriter.java:265)
	at org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyWriter.<init>(DirectoryTaxonomyWriter.java:192)
	at org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyWriter.<init>(DirectoryTaxonomyWriter.java:315)
	at org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyWriter.<init>(DirectoryTaxonomyWriter.java:332)
	at org.fao.geonet.kernel.search.index.TaxonomyIndexTracker.init(TaxonomyIndexTracker.java:46)
	at org.fao.geonet.kernel.search.index.TaxonomyIndexTracker.<init>(TaxonomyIndexTracker.java:40)
	at org.fao.geonet.kernel.search.index.LuceneIndexLanguageTracker.lazyInit(LuceneIndexLanguageTracker.java:69)
	... 28 more
Caused by: java.nio.channels.OverlappingFileLockException
	at sun.nio.ch.SharedFileLockTable.checkList(FileLockTable.java:255)
	at sun.nio.ch.SharedFileLockTable.add(FileLockTable.java:152)
	at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:1107)
	at java.nio.channels.FileChannel.tryLock(FileChannel.java:1155)
	at org.apache.lucene.store.NativeFSLock.obtain(NativeFSLockFactory.java:169)
	at org.apache.lucene.store.Lock.obtain(Lock.java:96)
	... 36 more