sleepycat [1] filed a orphan request for arangodb [2]:

ArangoDB 2.8.7 was released on 11/04/2016 and this package was updated
to 2.8.7 on 07/05/2016. Since then ArangoDB 2.8.9, 3.0.0 and 3.0.1
have all been released.

The package was flagged out-of-date 14/06/2016.

I realize that this is a best effort undertaking and the time people
can dedicate to it varies.
Is there still an appetite for keeping this up-to-date? If not, I'd be
happy to adopt this package.

[1] https://aur.archlinux.org/account/sleepycat/
[2] https://aur.archlinux.org/pkgbase/arangodb/