Facets aren't working

[Misha Tatinets]

I have rails app where I try to use both elasticsearch-rails and 
elasticsearch-model gems.
I'm getting results but facets aren't working. I wondering if anyone can 
pinpoint on what I am doing wrong.

Here is my code that  is written but example from elasticsearch team 
https://github.com/elasticsearch/elasticsearch-rails/tree/templates/elasticsearch-rails/lib/rails/templates
 


View 
 <div class="categories panel panel-default">
            <div class="list-group">
              <% @search.response['facets']['categories']['terms'].each do 
|c|  %>
                 <li> <%=
                      link_to companies_path(params.merge(c: c['term'])),
                              class: "list-group-item#{' active' if 
params[:c] == c['term']}" do
                        c['term'].html_safe + content_tag(:small, 
c['count'], class: 'badge').html_safe
                      end
                  %>   </li></br>
              <% end %>

            </div>

          </div>

module  SearchCompanies
  extend ActiveSupport::Concern
  included do
    include Elasticsearch::Model
 
  mapping   do
    indexes :name, :type => 'string', :boost => 10
    indexes :made_in_usa
    indexes :categories do
      indexes :id, :type => 'string'
      indexes :name, :type => 'string', analyzer: 'keyword'
    end
  end

  def as_indexed_json(options={})
    self.as_json(
        include: { categories:{only:[:name, :id]}})
  end

  def self.search(query, options={})
   
    __set_filters = lambda do |key, f|

      @search_definition[:filter][:and] ||= []
      @search_definition[:filter][:and]  |= [f]

      @search_definition[:facets][key.to_sym][:facet_filter][:and] ||= []
      @search_definition[:facets][key.to_sym][:facet_filter][:and]  |= [f]
    end

    @search_definition = {
        query: {},
        filter: {},

        facets: {
            categories: {
                terms: {
                    field: 'categories.name'
                },
                facet_filter: {}
            },
            made_in_usa: {
                terms: {
                    field: 'made_in_usa'
                },
                facet_filter: {}
            }
        }
    }

    unless query.blank?
      @search_definition[:query] = {
          bool: {
              should: [
                  { multi_match: {
                      query: query,
                      fields: ['name'],
                      operator: 'and'
                  }
                  }
              ]
          }
      }
    else
      @search_definition[:query] = { match_all: {} }
      @search_definition[:sort]  = { identification: 'desc' }
    end

    if options[:categories]
      f = { term: { 'categories.name' => options[:categories] } }

      __set_filters.(:made_in_usa, f)
    end

    if options[:made_in_usa]
      f = { term: { made_in_usa: options[:made_in_usa] } }

      __set_filters.(:categories, f)
    end

    if options[:sort]
      @search_definition[:sort]  = { options[:sort] => 'desc' }
      @search_definition[:track_scores] = true
    end

    __elasticsearch__.search(@search_definition)
  end
end
end

Controller 
  def search
    params[:query].present?
      @search = Company.search params[:query]
      @companies = @search.results.to_a
      respond_to do |format|
               format.html { @companies }
               format.json   { render :json => @companies}
             end
  end

My maping

{
  "companies" : {
    "mappings" : {
      "company" : {
        "properties" : {
          "categories" : {
            "properties" : {
              "id" : {
                "type" : "long"
              },
              "name" : {
                "type" : "string"
              }
            }
          },
          "id" : {
            "type" : "long"
          },
          "made_in_usa" : {
            "type" : "boolean"
          },
          "name" : {
            "type" : "string"
          }        
    }
  }
}


If anyone can see obvious error would you mind pinpoint it.

Thanks

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