This application is an example of integrating the {Elasticsearch}[http://www.elasticsearch.org] search engine with the {Ruby On Rails}[http://rubyonrails.org] web framework.

It has been generated by application templates available at https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch-rails/lib/rails/templates.

The basic version provides a simple integration for a simple Rails model, Article, showing how to include the search engine support in your model, automatically index changes to records, and use a form to perform simple search require 'requests.'

The pretty template builds on the basic version and brings couple of improvements:

• Using the Bootstrap framework to enhance the visual style of the application
• Using an Article.search class method to customize the default search definition
• Highlighting matching phrases in search results
• Paginating results with Kaminari

The expert template changes to a complex database schema with model relationships: article belongs to a category, has many authors and comments.

• The Elasticsearch integration is refactored into the Searchable concern
• A complex mapping for the index is defined
• A custom serialization is defined in Article#as_indexed_json
• The search method is amended with facets and suggestions
• A Sidekiq worker for handling index updates in background is added
• A custom SearchController with associated view is added
• A Rails initializer is added to customize the Elasticsearch client configuration
• Seed script and example data from New York Times is added

The dsl template refactors the search definition in SearchController#index to use the elasticsearch-dsl Rubygem for better expresivity and readability of the code.

The settings-files template refactors the Searchable module to load the index settings from an external file.