diff --git a/app/models/doi.rb b/app/models/doi.rb
index 188e9a93f..b2d2fa1f1 100644
--- a/app/models/doi.rb
+++ b/app/models/doi.rb
@@ -252,17 +252,21 @@ def self.index_by_day(options={})
     from_date = options[:from_date].present? ? Date.parse(options[:from_date]) : Date.current
     until_date = from_date + 1.day
     errors = 0
+    count = 0
 
-    Doi.where("updated >= ?", from_date.strftime("%F") + " 00:00:00").where("updated <= ?", until_date.strftime("%F") + " 00:00:00").find_in_batches(batch_size: 1000) do |dois|
+    logger = Logger.new(STDOUT)
+
+    Doi.where("updated >= ?", from_date.strftime("%F") + " 00:00:00").where("updated <= ?", until_date.strftime("%F") + " 00:00:00").find_in_batches(batch_size: 100) do |dois|
       response = Doi.__elasticsearch__.client.bulk \
         index:   Doi.index_name,
         type:    Doi.document_type,
         body:    dois.map { |doi| { index: { _id: doi.id, data: doi.as_indexed_json } } }
 
       errors += response['items'].map { |k, v| k.values.first['error'] }.compact.length
+      count += dois.length
     end
 
-    errors
+    logger.info "[Elasticsearch] #{errors} errors indexing #{count} DOIs updated on #{from_date.strftime("%F")}."
   end
 
   def uid
diff --git a/lib/tasks/doi.rake b/lib/tasks/doi.rake
index 94f6a8cbc..01751a3ff 100644
--- a/lib/tasks/doi.rake
+++ b/lib/tasks/doi.rake
@@ -20,8 +20,8 @@ namespace :doi do
   task :index_by_day => :environment do
     from_date = ENV['FROM_DATE'] || Date.current.strftime("%F")
 
-    count = Doi.index_by_day(from_date: from_date)
-    puts "DOIs updated on #{from_date} indexed with #{count} errors."
+    Doi.index_by_day(from_date: from_date)
+    puts "DOIs updated on #{from_date} indexed."
   end
 
   desc 'Set state'
diff --git a/spec/lib/tasks/doi_rake_spec.rb b/spec/lib/tasks/doi_rake_spec.rb
index 73a66ab6d..3b4ced6b0 100644
--- a/spec/lib/tasks/doi_rake_spec.rb
+++ b/spec/lib/tasks/doi_rake_spec.rb
@@ -31,7 +31,7 @@
   include_context "rake"
 
   let!(:doi)  { create_list(:doi, 10) }
-  let(:output) { "DOIs updated on 2018-01-04 indexed with 0 errors.\n" }
+  let(:output) { "DOIs updated on 2018-01-04 indexed.\n" }
 
   it "prerequisites should include environment" do
     expect(subject.prerequisites).to include("environment")