java.lang.IllegalArgumentException: The legacy format is no longer supported by this version of maven-indexer.
   at org.apache.maven.index.updater.DefaultIndexUpdater.loadIndexDirectory(DefaultIndexUpdater.java:209)
   at org.apache.maven.index.updater.DefaultIndexUpdater.access$300(DefaultIndexUpdater.java:76)
   at org.apache.maven.index.updater.DefaultIndexUpdater$LuceneIndexAdaptor.setIndexFile(DefaultIndexUpdater.java:515)
   at org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:749)
   at org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:160)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.indexLoadedRepo(NexusRepositoryIndexerImpl.java:549)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.access$200(NexusRepositoryIndexerImpl.java:145)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$2$1.run(NexusRepositoryIndexerImpl.java:645)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$2$1.run(NexusRepositoryIndexerImpl.java:642)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.writeAccess(DefaultMutexImplementation.java:250)
   at org.openide.util.Mutex.writeAccess(Mutex.java:271)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$2.run(NexusRepositoryIndexerImpl.java:642)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalArgumentException: The legacy format is no longer supported by this version of maven-indexer.
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:420)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.spawnIndexLoadedRepo(NexusRepositoryIndexerImpl.java:639)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.access$1000(NexusRepositoryIndexerImpl.java:145)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$6.run(NexusRepositoryIndexerImpl.java:961)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl$6.run(NexusRepositoryIndexerImpl.java:952)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.writeAccess(DefaultMutexImplementation.java:250)
   at org.openide.util.Mutex.writeAccess(Mutex.java:271)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.iterate(NexusRepositoryIndexerImpl.java:952)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.findVersionsByClass(NexusRepositoryIndexerImpl.java:1206)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.findVersionsByClass(NexusRepositoryIndexerImpl.java:1200)
   at org.netbeans.modules.maven.indexer.api.RepositoryQueries.lambda$findVersionsByClassResult$9(RepositoryQueries.java:402)
   at org.netbeans.modules.maven.indexer.api.RepositoryQueries$$Lambda$509/1399708701.call(RepositoryQueries.java:0)
   at org.netbeans.modules.maven.indexer.api.RepositoryQueries.getQueryResult(RepositoryQueries.java:240)
   at org.netbeans.modules.maven.indexer.api.RepositoryQueries.findVersionsByClassResult(RepositoryQueries.java:399)
   at org.netbeans.modules.maven.hints.ui.SearchDependencyUI$Tsk.run(SearchDependencyUI.java:215)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)