```ruby
require 'multi_json'

class ElasticSearchRegisterer
  def initialize(client, namespace)
    @http_client = client
    @namespace = namespace
  end

  def store_map(mapping)
    http_client.put(index_path, index_settings)
    http_client.put(mapping_path(mapping), json_mapping(mapping))
  rescue Faraday::Error::ClientError => e
    fail e unless e.response.fetch(:body).include?("already exists")
  end

private
  attr_reader :http_client, :namespace

  def index_path
    "/#{namespace}"
  end

  def mapping_path(mapping)
    [index_path, mapping.finder_slug, "_mapping"].join("/")
  end

  def json_mapping(mapping)
    MultiJson.dump(mapping.to_h)
  end

  def index_settings
    {
      "settings" => {
        "analysis" => {
          "analyzer" => {
            "default" => {
              "type" => "custom",
              "tokenizer" => "standard",
              "filter" => %w(standard lowercase stemmer_english),
            },
          },
          "filter" => {
            "stemmer_english" => {
              "type" => "stemmer",
              "name" => "english",
            },
          }
        }
      }
    }
  end
end
```

Fix case sensitivity in rescue of exceptions
user
```ruby
require 'multi_json'

class ElasticSearchRegisterer
  def initialize(client, namespace)
    @http_client = client
    @namespace = namespace
  end

  def store_map(mapping)
    http_client.put(index_path, index_settings)
    http_client.put(mapping_path(mapping), json_mapping(mapping))
  rescue Faraday::Error::ClientError => e
    fail e unless e.response.fetch(:body).match(/already exists/i)
  end

private
  attr_reader :http_client, :namespace

  def index_path
    "/#{namespace}"
  end

  def mapping_path(mapping)
    [index_path, mapping.finder_slug, "_mapping"].join("/")
  end

  def json_mapping(mapping)
    MultiJson.dump(mapping.to_h)
  end

  def index_settings
    {
      "settings" => {
        "analysis" => {
          "analyzer" => {
            "default" => {
              "type" => "custom",
              "tokenizer" => "standard",
              "filter" => %w(standard lowercase stemmer_english),
            },
          },
          "filter" => {
            "stemmer_english" => {
              "type" => "stemmer",
              "name" => "english",
            },
          }
        }
      }
    }
  end
end
```
assistant