elasticsearch.rb

require 'faraday_middleware/aws_signers_v4'

transport_configuration = lambda do |f|
  f.request :aws_signers_v4,
    credentials: Aws::Credentials.new(ENV['AWS_ELASTICSEARCH_KEY'], ENV['AWS_ELASTICSEARCH_SECRET']),
    service_name: 'es',
    region: 'us-east-1'
  
  f.response :logger
  f.adapter Faraday.default_adapter
end

transport = Elasticsearch::Transport::Transport::HTTP::Faraday.new \
  hosts: [{ scheme: 'https', host: ENV['AWS_ELASTICSEARCH_HOST'], port: '443' }],
  &transport_configuration

Elasticsearch::Model.client = Elasticsearch::Client.new transport: transport

How use this?