ankane/searchkick — pull request #283 by exAspArk (2014-09-18 09:59:30+00:00)
Title: add indices_boost option support

Hi, I'd like to add [indices_boost](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-index-boost.html) support. For example:

```ruby
User.search("*", index_name: [:foo, :bar], indices_boost: { foo: 1, bar: 2 })
```