[Koha-bugs] [Bug 27770] ES: Deprecated aggregation order key [_term] used, replaced by [_key]

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=27770

--- Comment #12 from Victor Grousset/tuxayo <victor at tuxayo.net> ---
(In reply to Fridolin Somers from comment #9)
> When turning off pref ElasticsearchCrossFields you may use ES 5 but
> requirements page says ES 6 :
> https://wiki.koha-community.org/wiki/System_requirements_and_recommendations

That seems like a bonus. It doesn't seem to have been mentioned and thus lead
to dropping ES5 from the sys reqs. We indeed could have been more subtle in
dropping ES5 if ElasticsearchCrossFields off is not a big deal for many Koha
instances. Anyway, ES5 was eol for a while at that time.


> Maybe only backport to stable 21.11 and not lower.

Too much downsides IMO. ES6 is eol so if something like the log4j critical
security vulnerabilities happen again, ES7 is the only fix.
So down to Koha 19.11, compat is need in order to get back to having an ES
supported. (even if ES7 is not longer libre/open source but that's another
topic once ES7 compat is sorted out)

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