elastic search category filter

low_level.rb

client = Elasticsearch::Client.new host: 'localhost:9200', logger: Rails.logger

client.indices.create({
  index: "businesses",
  body: {
    settings: {},
     mappings: {
       "business" => {
         properties:{
           name:          {:type=>"string",  index: "not_analyzed"}, # you probably need different index type depending on what kind of queries there are
           category:      {:type=>"string",  index: "not_analyzed"},
         }
       }
     }
  }
})

# reindex
Business.select("id, name, category").find_each do |b|
  client.index  index: 'businesses', type: 'businesses', id: u.id, body: {
    name: b.name,
    category: b.category,
  }
end

# search
search = client.search({
  index: 'businesses',
  body: {
    query: {
      filtered: {
        query: {
          query_string: {query: params["query"]}
        },
        filter: { 
          term: { # 'terms' if you need multiple categories (OR query)
            category: params["category"]
          }
        }
      }
    },
    from: params["from"] || 0,
    size: params["size"]
  }
})