[Koha-bugs] [Bug 33353] Add compatibility with Elasticsearch 8

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=33353

--- Comment #13 from Victor Grousset/tuxayo <victor at tuxayo.net> ---
After having this in main/master there will be the question of backporting (now
or later) to 22.11 which is the LTS. Because before the end of the LTS it's
likely that ES 7 won't be supported anymore.

Here https://www.elastic.co/support/eol#elasticsearch
we can see that branch 7.x will be supported until 9.x comes out.

There is no alpha version of 9.x for now, but when there will be, the stable
release can be expected 6 months later. (learned this in ES forums) So people
interested can keep an eye here: https://github.com/elastic/elasticsearch/tags
for when the 1st 9.x alpha pops.

Also, for OpenSearch, it's already planned that 1.x will reach end of life
before the end of 22.11's support.
https://opensearch.org/releases.html => "Maintenance Window End" => "December
31, 2023"

So what's the best strategy? (because it implies dropping 6.x support)
1. backport now
2. backport when/a bit before OpenSearch 1.x support ends (December 31, 2023)
3. backport when/a bit before ElasticSearch 7.x support will have also ended.
(we don't know yet, it could be sooner than OS 1 or later)
4. don't backport and require ES 7 or OS 1 Koha admins to keep an end of life
search engine or upgrade from the LTS.

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