Migrate off elasticsearch-dsl and possibly django-elasticsearch-dsl

[mlissner]

In #5533, Alberto noted that a number of our Elastic dependencies are set for deprecation:

Unfortunately, django-elasticsearch-dsl, the high-level integration, is locked to the 8.x series and hasn’t been updated recently. As a result, the highest elasticsearch-dsl version we can install is 8.17.1

And there is more, the standalone elasticsearch-dsl package itself is now deprecated, latest version available is 8.18 and for 9.x clusters the DSL package has been merged into the lower-level elasticsearch-py library: https://www.elastic.co/docs/reference/elasticsearch/clients/python/dsl_migrating

So we need to take some time to work through this and upgrade accordingly.

[mlissner]

In this sprint, let's start the discussion with django-elasticsearch-dsl to see if they want our contributions.

Assuming they like it, we'll actually do the work during I sprint.

[albertisfu]

There is already a PR merged that adds support for ES9 client versions.

I believe we just need to wait for it to be released.