Bug 22771: Respect nonfiling indicators for search fields

Bug 22771: Respect nonfiling indicators for search fields

Strip initial characters from search fields in accordance with
nonfiling character indicators.

To test:

1) Apply patch
2) Run tests in t/Koha/SearchEngine/Elasticsearch.t
3) All tests should pass

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Joy Nelson <joy@bywatersolutions.com>