Solr delete not working for some reason

Question

Just trying to delete all the documents, and did this:

http://localhost:8983/solr/update?stream.body=%3Cdelete%3E%3Cquery%3E*:*%3C/query%3E%3C/delete%3E
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Answer 1

In Lucene wiki :

it will still be found, because index changes are not visible until, and a new searcher is opened. To cause this to happen, send a commit command to Solr (post.jar does this for you by default)

Maybe you can POST a message to Solr.