AWS Elasticsearch Serviceが律儀にgzipを返すようになって死んだ [解決済み] ref: http://qiita.com/tady/items/eb924cc06e8c1ed5ae9a

aws.rb

Elasticsearch::Model.client = Elasticsearch::Client.new(
  host: ENV.fetch('ELASTICSEARCH_ENDPOINT'),
  port: 80
) do |faraday|
  faraday.use FaradayMiddleware::Gzip # ここを追加
  faraday.request :aws_signers_v4,
                  credentials: Aws::Credentials.new(ENV.fetch('AWS_KEY_ID'), ENV.fetch('AWS_ACCESS_KEY')),
                  service_name: 'es',
                  region: 'ap-northeast-1'
  faraday.adapter Faraday.default_adapter
end

file0.txt

MultiJson::ParseError: unexpected character at line 1, column 1 [parse.c:664]

file1.txt

elasticsearch (5.0.0)
elasticsearch-api (5.0.0)
elasticsearch-transport (5.0.0)
elasticsearch-dsl (0.1.4)
elasticsearch-model (0.1.9)
elasticsearch-rails (0.1.9)
elasticsearch-transport (5.0.0)
faraday (0.9.2)
faraday_middleware (0.12.2)
faraday_middleware-aws-signers-v4 (0.1.5)

file4.txt

  # This middleware is NOT necessary when these adapters are used:
  # - net_http on Ruby 1.9+
  # - net_http_persistent on Ruby 2.0+
  # - em_http

file5.txt

if Net::HTTP::HAVE_ZLIB
  env.request_headers['Accept-Encoding'] ||= 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3'
end

Gemfile

...
gem 'faraday_middleware'
...