Solr indexer throws an important amount of execptions when a subwiki is deleted

When deleting a subwiki, the Solr indexer job throws SolrIndexerException: Failed to get input Solr document for every document present in the deleted subwiki.

The main problem is that we have a lot of those exceptions. In my case, the size of the catalina.out log file went from a few kilobytes to around 9M.

Here is an example of one exception thrown : https://up1.xwikisas.com/#oYDS_meucHexq-8QDGc3gg