Allow custom scripts?

[ElliottKasoar]

Enabling users to submit custom queries via a script written in something like Python has been requested.

This should be possible, as we currently use the painless language to perform a limited selection of script queries.

Other languages may be available via plugins, but are not necessarily well supported.

Additionally, it's not obvious to what extent this can be supported, as the form of the "script" requires a relatively high level of understanding of the database structure, so the additional complexity of wrapping the script in the correct form may be relatively minor.