Maintenance: Reduce log output by switching log level of serveral places.

app/models/active_job_lock.rb

@@ -9,7 +9,7 @@ class ActiveJobLock < ActiveRecord::Base
   end
 
   def transfer_to(active_job)
-    logger.info "Transferring ActiveJobLock with id '#{id}' from active_job_id '#{active_job_id}' to active_job_id '#{active_job_id}'."
+    logger.debug { "Transferring ActiveJobLock with id '#{id}' from active_job_id '#{active_job_id}' to active_job_id '#{active_job_id}'." }
 
     reset_time_stamp = Time.zone.now
     update!(

app/models/channel/driver/imap.rb

@@ -354,7 +354,6 @@ example
       raise too_large_messages.join("\n")
     end
 
-    Rails.logger.info 'done'
     {
       result:  result,
       fetched: count_fetched,

lib/notification_factory/mailer.rb

@@ -147,7 +147,7 @@ returns
     raise Exceptions::UnprocessableEntity, "Unable to send mail to user with id #{data[:recipient][:id]} because there is no email available." if data[:recipient][:email].blank?
 
     sender = Setting.get('notification_sender')
-    Rails.logger.info "Send notification to: #{data[:recipient][:email]} (from:#{sender}/subject:#{data[:subject]})"
+    Rails.logger.debug { "Send notification to: #{data[:recipient][:email]} (from:#{sender}/subject:#{data[:subject]})" }
 
     content_type = 'text/plain'
     if data[:content_type]

lib/search_index_backend.rb

@@ -319,7 +319,7 @@ remove whole data from index
     return [] if !data
 
     data.map do |item|
-      Rails.logger.info "... #{item['_type']} #{item['_id']}"
+      Rails.logger.debug { "... #{item['_type']} #{item['_id']}" }
 
       output = {
         id:   item['_id'],
@@ -915,7 +915,7 @@ helper method for making HTTP calls
 
 =end
   def self.make_request(url, data: {}, method: :get, open_timeout: 8, read_timeout: 180)
-    Rails.logger.info "# curl -X #{method} \"#{url}\" "
+    Rails.logger.debug { "# curl -X #{method} \"#{url}\" " }
     Rails.logger.debug { "-d '#{data.to_json}'" } if data.present?
 
     options = {
@@ -930,7 +930,7 @@ helper method for making HTTP calls
 
     response = UserAgent.send(method, url, data, options)
 
-    Rails.logger.info "# #{response.code}"
+    Rails.logger.debug { "# #{response.code}" }
 
     response
   end