Files are not removed from index when running occ fulltextsearch:index after being removed from nextcloud

Hi, i use nextcloud 15, elasticsearch-6.8.23-1, files_fulltextsearch-1.2.10, fulltextsearch-1.2.10.
The problem is reproduced as follows:

• create file 1.txt with content "tmp"
• run occ fulltextsearch:index
• enter the query "tmp" and I see the correct result
• delete 1.txt from nextcloud
• run occ fulltextsearch:index
• enter the query "tmp" and see the title "search in Files for 'tmp' returned 1 results in 3ms", but the list of found files is empty

So file 1.txt is not removed from the index, although it should have been removed

In the oc_fulltextsearch_indexes table, the status of the index is correct, i.e. is 16 (INDEX_REMOVED).

If I understand correctly, then in IndexService.php in the indexProviderContentFromUser function, we get a list of documents using the $provider->generateIndexableDocuments($userId) command, then we analyze the index status of the received documents, and if necessary, update the index using the IFullTextSearchPlatform platform.

But $provider->generateIndexableDocuments($userId) will not return documents deleted from nextcloud and index is not updated with IFullTextSearchPlatform

Start in IndexService.php at indexProviderContentFromUser and trace generateIndexableDocuments($userId) together with IFullTextSearchPlatform. Reproduce the deletion scenario described in the issue, then verify that a removed file is removed from the search index rather than only marked INDEX_REMOVED in oc_fulltextsearch_indexes.