Add Search API spellcheck.

[stooit]

This (combined with Acquia Search) allows us to provide 'Did you mean...?' functionality via Search API pages or views.

Demo environment to follow.

[govCMS-bot]

The pull request environment has been successfully built.

Visit PR environment here: http://138.govcms.xyz/

[stooit]

Demo environment details:

Search page configured against Acquia Search with spellcheck enabled:

• http://138.govcms.xyz/search-solr
• attempt a search for misspelled text (found across any fulltext indexed field), e.g:
  • amnisty /amnsty / etc (will suggest "amnesty")
  • boots / bots / bouts etc (will suggest "boats")
  • any other words found in the title or body of pages should return relevant 'did you mean' results

This functionality requires Solr, it will not function with the 'out of the box' database index.

[invisigoth]

Depending on how Solr is configured and the content in your index, this function could potentially be more confusing than offering useful suggestions. For example, searching "bike shed" will suggest "fire said" and misspelled "bike ched" will suggest "fire them". This relates to issue #109.

[fiasco]

This pull request needs to be re-submitted against the 7.x-2.x branch as the master branch has been removed per #226

Apologies for the inconvenience.

[ElviaMaschke]

I just want to know how Solr runs a search query and if it is using Australia english or US, UK??