SRCH-1837 add Elasticsearch client logging to Rails log (#73)

Author: MothOnMars

config/elasticsearch.yml

@@ -4,6 +4,12 @@ development: &default
   user: ''
   password: ''
   number_of_shards: 1
+  log: true
+  log_level: DEBUG
 
 test:
   <<: *default
+
+production:
+  # Changes to the production configuration must be
+  # made in the cookbooks

config/initializers/elasticsearch.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 Elasticsearch::Persistence.client = Elasticsearch::Client.new(
-  log: Rails.env.development?,
+  log: Rails.configuration.elasticsearch['log'],
   hosts: Rails.configuration.elasticsearch['hosts'],
   user: Rails.configuration.elasticsearch['user'],
   password: Rails.configuration.elasticsearch['password'],
@@ -10,12 +10,14 @@
   reload_connections: true
 )
 
-if Rails.env.development?
-  logger = ActiveSupport::Logger.new(STDERR)
-  logger.level = Logger::DEBUG
-  logger.formatter = proc { |_s, _d, _p, m| "\e[2m#{m}\n\e[0m" }
-  Elasticsearch::Persistence.client.transport.logger = logger
+logger = ActiveSupport::Logger.new("log/#{Rails.env}.log")
+logger.level = Rails.configuration.elasticsearch['log_level']
+logger.formatter = proc do |severity, time, _progname, msg|
+  "\e[2m[ES][#{time.utc.iso8601(6)}][#{severity}] #{msg}\n\e[0m"
+end
+Elasticsearch::Persistence.client.transport.logger = logger
 
+if Rails.env.development?
   puts 'Ensuring Elasticsearch development indexes and aliases are available....'
   Dir[Rails.root.join('app', 'models', '*.rb')].map do |f|
     klass = File.basename(f, '.*').camelize.constantize