I've noticed warnings in our logs like this recently. Any idea what they mean?
22.10.2020 15:20:57.981 *WARN* [oak-lucene-6899] org.apache.jackrabbit.oak.plugins.index.lucene.IndexCopier File _jz.fdx doesn't exist in /export/home1/adobe/AEM-4503/crx-quickstart/repository/index/digitalDepotAssetLucene-1584463953619/suggestdata
22.10.2020 15:20:57.981 *WARN* [oak-lucene-6899] org.apache.jackrabbit.oak.plugins.index.lucene.directory.CopyOnReadDirectory Couldn't compute safe timestamp to delete files from NIOFSDirectory@/export/home1/adobe/AEM-4503/crx-quickstart/repository/index/digitalDepotAssetLucene-1584463953619/suggestdata lockFactory=NativeFSLockFactory@/export/home1/adobe/AEM-4503/crx-quickstart/repository/index/digitalDepotAssetLucene-1584463953619/suggestdata