This patch prepares Koha to officially no longer support Elasticsearch 5.X
It adds a new system preference 'ElasticsearchCrossFields' to allow users to choose whether or not
to enable this feature
It updates the about page to add a deprecation warning if a site is running ES5
To test:
1 - Be running Koha with Elasticsearch 5.X
2 - Attempt to search
Error: Unable to perform your search. Please try again.
3 - Apply patch
4 - Update database
5 - Searching works
6 - Find syspref 'ElasticsearchCrossFields'
7 - Enable it
8 - Searching is now broken
9 - Check the about page
10 - you can now see the Elasticsearch version
11 - The systeminformation tab has a deprectaion warning
12 - Set SearchEngine preference to 'Zebra'
13 - View the about page - no warnings
14 - Test again with ES6 - searching should "work" with either pref setting
15 - There should be no warning on about pages
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Nick Clemens
181267bd2b