Bug 30883: Authorities merge is limited to 100 biblio with Elasticsearch

Bug 30883: Authorities merge is limited to 100 biblio with Elasticsearch

In C4::AuthoritiesMarc::merge, we search all biblio records using an authority with Koha::Authorities->linked_biblionumbers().
This method uses simple_search_compat() with no results limit, even saying in comment :
https://git.koha-community.org/Koha-community/Koha/src/commit/44d6528b566e5c16eba9b15f8aa24667293766c3/Koha/Authorities.pm#L80

With Zebra searchengin it is correct.

But not with Elasticsearch, there is an hardcoded limit at 100 in case no limit is given :
https://git.koha-community.org/Koha-community/Koha/src/commit/44d6528b566e5c16eba9b15f8aa24667293766c3/Koha/SearchEngine/Elasticsearch/Search.pm#L346

This means authorities links are wrong after a merge or an edit in case the authority is used in more than 100 biblio records.

:(

I propose to fix by using by default the real server max given by Koha::SearchEngine::Elasticsearch::Search::max_result_window().
This will allow a huge limit nearly impossible to reach.
See Bug 30882 to how increase this limit.

Test plan :
1) Use Elasticsearch search engine
2) Use an authority id=111 linked to 200 biblio records
3) Perform a search 'an:111', you get 200 results
4) Create a new authority id=222 linked to 2 biblio records
5) Perform a search 'an:222', you get 2 results
6) Perform a merge of the two authorties, keeping id=222
7) Perform a search 'an:111'
   without patch you get 100 results
   with patch you get no results
8) Perform a search 'an:222'
   without patch you get 102 results
   with patch you get 202 results

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>