Hi, I performed the same operation for 6 months to delete document older than 6 months with the delete by query api.
I don't know why but today all my documents get deleted with this request. I have a staging server with the same data and everything is OK. I don<t know if there is a safer way to delete data. I run that request every 10 minutes and it delete about 200 documents each time. But today this request delete over 1Million documents.