Bug 19575: Use canonical field names and resolve aliased fields

Bug 19575: Use canonical field names and resolve aliased fields

Adjust elastic search mappings to more closely match Zebra equivalents
resolving serveral issues with coded Zebra searches in templates and
sorting of search results in UI. Also make field names in search strings
case insensitive to accept case variations in template links and user input.

Sponsored-by: Gothenburg University Library

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Ere Maijala <ere.maijala@helsinki.fi>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>