Constantly getting warning message Exception while improving searchresult

Hi! I am constantly getting the warning message "Exception while improving searchresult" with the trace log:

[files_fulltextsearch] Warning: Exception while improving searchresult:  - trace: [{"file":"\/var\/www\/html\/nextcloud\/apps\/files_fulltextsearch\/lib\/Service\/SearchService.php","line":272,"function":"getFileFromId","class":"OCA\\Files_FullTextSearch\\Service\\FilesService","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/apps\/files_fulltextsearch\/lib\/Service\/SearchService.php","line":232,"function":"setDocumentInfo","class":"OCA\\Files_FullTextSearch\\Service\\SearchService","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/apps\/files_fulltextsearch\/lib\/Provider\/FilesProvider.php","line":359,"function":"improveSearchResult","class":"OCA\\Files_FullTextSearch\\Service\\SearchService","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/apps\/fulltextsearch\/lib\/Service\/SearchService.php","line":203,"function":"improveSearchResult","class":"OCA\\Files_FullTextSearch\\Provider\\FilesProvider","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/apps\/fulltextsearch\/lib\/Service\/SearchService.php","line":166,"function":"searchFromProviders","class":"OCA\\FullTextSearch\\Service\\SearchService","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/apps\/fulltextsearch\/lib\/Search\/UnifiedSearchProvider.php","line":139,"function":"search","class":"OCA\\FullTextSearch\\Service\\SearchService","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/lib\/private\/Search\/SearchComposer.php","line":159,"function":"search","class":"OCA\\FullTextSearch\\Search\\UnifiedSearchProvider","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/core\/Controller\/UnifiedSearchController.php","line":101,"function":"search","class":"OC\\Search\\SearchComposer","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/lib\/private\/AppFramework\/Http\/Dispatcher.php","line":230,"function":"search","class":"OC\\Core\\Controller\\UnifiedSearchController","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/lib\/private\/AppFramework\/Http\/Dispatcher.php","line":137,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/lib\/private\/AppFramework\/App.php","line":183,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/lib\/private\/Route\/Router.php","line":315,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"\/var\/www\/html\/nextcloud\/ocs\/v1.php","line":64,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"\/var\/www\/html\/nextcloud\/ocs\/v2.php","line":23,"args":["\/var\/www\/html\/nextcloud\/ocs\/v1.php"],"function":"require_once"}]

GET /ocs/v2.php/search/providers/fulltextsearch/search?term=test&from=%2Fapps%2Ffiles%2Ffiles%3Fdir%3D%2FDocuments%26fileid%3D674

NC 27.1.4 Ubuntu 22.04
PHP-FPM 8.2
Using ElasticSearch 8.8.2 in docker (https://github.com/R0Wi/elasticsearch-nextcloud-docker/) with the basic authentication enabled and self-signed certificate.

Start with apps/files_fulltextsearch/lib/Service/SearchService.php at lines 232 and 272, then follow the call from apps/files_fulltextsearch/lib/Provider/FilesProvider.php line 359. Reproduce the reported GET request against the described Nextcloud and Elasticsearch setup and determine why improving the result raises the exception. Done means the warning is no longer produced for this search.