Bug 27307: Don't drop phrase directive when searching keyword index

Bug 27307: Don't drop phrase directive when searching keyword index

We convert 'keyword' to '' as an index since we want it to search all fields

When we are searching 'as phrase', however, we should not drop the search type

To test:
 1 - Enable IntranetCatalogPullDown
 2 - Set searchEngine to Elasticsearch
 3 - Perform a search for 'Keyword as phrase' for a phrase that does appear in a record
 4 - You get the result
 5 - Reverse the order of words in the phrase
 6 - You still get a result?
 7 - Apply patch
 8 - Restart all the things
 9 - Reversed search does not return record
10 - Correct order and search, correct record returned

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>