This is based of ElasticSearch.

search_controller.rb

class SearchController < ApplicationController
      before_action :set_search_option, only: [:index]

  # Query the product model and return all indexed items.
  def index
    @product_results = ProductsIndex.aggregations(search_aggregations)
    apply_filters(@search_options[:search_with]).each { |filter| @product_results = @product_results.merge(filter) }

    # Apply any facet filters already selected
    if @search_term.present?
      # Add search term to search and setup suggestions
      @product_results = @product_results.merge(ProductsIndex.query(query_string: { query: prepare_query(@search_term), fields: search_fields }))
      @product_results = @product_results.merge(ProductsIndex.suggest(suggestions: {text: @search_term, term: {field: :name}}))
    end
    @product_results = @product_results.merge(ProductsIndex.filter{ sold_out == false })
    @products = @product_results.order(@search_options[:order_by]).load(scope: -> { includes(:quote) }).per(8).page(@page) # Load the product results
  end

  def apply_filters(search_options = {}, type='product')
    options = []

    case type
    when 'product'
      search_options.each_pair { |k,v| options << ProductsIndex.filter({term: {"#{k.to_s}_facet".to_sym => ActionController::Base.helpers.strip_tags(v)}}) unless k == 'type_facet' }
    end
    options
  end

  def prepare_query(query)
    query = clean_query(query)
    return query unless query.split(' ').first.present?
    wc_query = ''
    query.split(' ').each { |q| wc_query << (q.is_a?(Numeric) ? "+#{q} " : "+#{q}* ") }
    wc_query.strip
  end

  def clean_query(query)
    query = query.try(:squish)
    query = query.gsub('"', '') if (query.count('"') % 2) != 0
    query = query.gsub(/[^a-zA-Z0-9']/, ' ').squish
    query
  end

  # This attributes are passed
  def search_fields
    %w(quote author^5 year)
  end

    private

      def set_search_option
        search_conditions, search_with, order_by, search_term = search_options
        @search_options = { search_conditions: search_conditions, search_with: search_with, order_by: order_by, search_term: search_term }

        @display_search_by = cookies[:display_search_by].present? ? cookies[:display_search_by] : 'grid'

        if params.present? && params[:search].present?
          @search_term = params[:search].encode!('UTF-16', 'UTF-8', invalid: :replace, replace: '')
          @search_term = @search_term.encode!('UTF-8', 'UTF-16')
        else
          @search_term = params[:search]
        end

        @per_page = (params[:page] || 8).to_i
        @page = (params[:page] || 1).to_i
        @per_page = 8 if @per_page < 1
        @page = 1 if @page < 1

        @used_facets = search_with
        @available_facets = product_aggregation_fields('quote')

        @groups = params.select { |p| ['category', 'single', 'marriage'].include?(p) }
        @filters = params.select { |p| ['price', 'count'].include?(p) }
      end
end