Searchkick

Search made easy

Usage

Change Mappings with Zero Downtime

Elasticsearch has a feature called aliases that allows you to change mappings with no downtime.

Book.tire.reindex

This creates a new index books_20130714181054 and points the books alias to the new index when complete - an atomic operation :)

First time: If books is an existing index, it will be replaced by an alias.

Searchkick uses find_in_batches to import documents. To filter documents or eagar load associations, use the tire_import scope.

class Book < ActiveRecord::Base
  scope :tire_import, where(active: true).includes(:author, :chapters)
end

There is also a rake task.

rake searchkick:reindex CLASS=Book

Thanks to Jaroslav Kalistsuk for the original source.

Clinton Gormley also has a good post on this.

Gotchas

Mappings

When changing the mapping in a model, you must create a new index for the changes to take place. Elasticsearch does not support updates to the mapping. For zero downtime, use the reindex method above which creates a new index and swaps it in once built. To see the current mapping, use:

curl http://localhost:9200/books/_mapping

Low Number of Documents

By default, Tire creates an index on 5 shards - even in development. With a low number of documents, you will get inconsistent relevance scores by default. There are two different ways to fix this:

• Use one shard

settings: {number_of_shards: 1}

• Set the search type to dfs_query_and_fetch. More about search types here.

Installation

Add this line to your application's Gemfile:

gem "searchkick"

And then execute:

bundle

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request