[PRQ#39800] Deletion Request for elasticsearch6

HLFH [1] filed a deletion request for elasticsearch6 [2]: Orphan package unmaintained for 2 years and now unsafe. elasticsearch and elasticsearch7 AUR packages should be preferred. [1] https://aur.archlinux.org/account/HLFH/ [2] https://aur.archlinux.org/pkgbase/elasticsearch6/