Bug 26313: "Show analytics" link must use uppercase for booleans

Bug 26313: "Show analytics" link must use uppercase for booleans

In elasticsearch we only treat AND and OR as boolean operators if
they are capitalized

To test:
- Turn SearchEngine to Elasticsearch and make sure it works
- Pick any serial record in your database, make sure 001 is set
- Go to new > new child record
- Fill in 245 and save
- Click on the "In" link, it should bring you to the parent record
- Click on "Show analytics" => there will be no result
- Apply patch
- restart and reload
- Try again
- It works!
- Switch SearchEngine syspref to 'Zebra'
- Test again
- It still works!

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>