[Tests] Refactors initialization of the client for YAML test runner

Author: picandocodigo

elasticsearch-api/spec/yaml-test-runner/run.rb

@@ -49,11 +49,9 @@
   transport_options = {}
 end
 
-CLIENT = if ENV['ES_API_KEY']
-           Elasticsearch::Client.new(host: host, api_key: ENV['ES_API_KEY'], transport_options: transport_options)
-         else
-           Elasticsearch::Client.new(host: host, transport_options: transport_options)
-         end
+options = { host: host, transport_options: transport_options, compression: true }
+options.merge!({ api_key: ENV['ES_API_KEY'] }) if ENV['ES_API_KEY']
+CLIENT = Elasticsearch::Client.new(options)
 
 tests_path = File.expand_path('./tmp', __dir__)
 ruby_version = if defined? JRUBY_VERSION