Bug 33406: Add tests

Bug 33406: Add tests

Test plan:
1) Apply this tests patch only
2) Run: prove t/Koha/SearchEngine/ElasticSearch/Search.t
3) Notice it fails with nasty ES "Failed to parse query" error
4) Apply the other patches
5) Repeat 2) - notice theres no nasty error

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit fbd62562e0d67d22738435e44adf9f03900a147e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit f36647c32a7224146ff2a8420b4c3243562f094c)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>