FullTextSearch module

Adds support for fulltext search engines like Sphinx and Solr to SilverStripe CMS.

Maintainer Contact

See docs/en/index.md

Get rid of includeSubclasses - isn't actually used in practice, makes the codebase uglier, and ClassHierarchy can be used at query time for most of the same use cases
Fix field referencing in queries. Should be able to do $query->search('Text', 'Content'), not $query->search('Text', 'SiteTree_Content') like you have to do now
- Make sure that when field exists in multiple classes, searching against bare fields searches all of them
- Allow searching against specific instances too
Make fields restrictable by class in an index - 'SiteTree#Content' to limit fields to a particular class, maybe 'Content->Summary' to allow calling a specific method on the field object to get the text
Allow following user relationships (Children.Foo for example)
Be clearer about what happens with relationships to stateful objects (e.g. Parent.Foo where Parent is versioned)
Improvements to SearchUpdater
- Make it work properly when in-between objects (the A in A.B.Foo) update
- Allow user logic to cause triggering reindex of documents when field is user generated
Add sphinx connector
Add generic APIs for spell correction, file text extraction and snippet generation
Better docs