Bug 22295: Make Elasticsearch query builder group multi-term queries

Bug 22295: Make Elasticsearch query builder group multi-term queries

Test plan:

1. Do an advanced search for
Title = new
AND
Title = york
2. Verify that the results match an advanced search for:
Title = new york
3. Verify that tests in t/db_dependent/Koha/SearchEngine/Elasticsearch still pass

Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit e90cb16d79f611caa3cd6d6cbbca4ea01d7a8077)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>