UIS449: Upgraded NEST version and majority of test search interface complete
US449: Added check if searching job title field at all
US449: Added configuration to allow full control over search in application
US449: Search ordering by relevancy working
US449: Force elastic to track score even when order by geo / other fields
Added resilience to index creation to allow vacancy loader to continue if index already created but empty
US449: Sorting by keyword relevance UI complete
Fixed vacancy mapping with latest NEST version and introduced snowball stemming analyzer.
Merge conflicts from master
Reviewed merge and tidied up.
Only need Analyzer set, it overrides both search and index analyzers.
Added analyzer to employer name - just in case we start to search (and needed for test app)
Merge branch 'feature/searchtestapp'
Merging search update feature branch into master
Updating NEST checks to use latest API