[Gem] Fixes Bulk Helper update with slice

elasticsearch/lib/elasticsearch/helpers/bulk_helper.rb

@@ -76,12 +76,15 @@ def delete(ids, params = {}, body = {})
       # @yieldparam ingest_docs [Array<Hash>] The collection of documents sent in the bulk request.
       #
       def update(docs, params = {}, body = {}, &block)
-        ingest_docs = docs.map do |doc|
-          { update: { _index: @index, _id: doc.delete('id'), data: { doc: doc } } }
-        end
-        if (slice = params.delete(:slice))
-          ingest_docs.each_slice(slice) { |items| update(items, params, &block) }
+        if (slice = params[:slice])
+          request_params = params.dup
+          request_params.delete(:slice)
+          docs.each_slice(slice) { |items| update(items, request_params, &block) }
         else
+          ingest_docs = docs.map do |doc|
+            document = doc.dup
+            { update: { _index: @index, _id: document.delete('id'), data: { doc: document } } }
+          end
           bulk_request(ingest_docs, params, &block)
         end
       end

elasticsearch/spec/integration/helpers/bulk_helper_spec.rb

@@ -65,6 +65,29 @@
       response = bulk_helper.update(docs)
       expect(response.status).to eq(200)
       expect(response['items'].map { |i| i['update']['result'] }.uniq.first).to eq('updated')
+      expect(docs.map { |doc| doc['id'] }).not_to include(nil)
+    end
+
+    it 'Updates documents in slices' do
+      docs = [
+        { scientific_name: 'Otocyon megalotos', name: 'Bat-eared fox' },
+        { scientific_name: 'Herpestes javanicus', name: 'Small Indian mongoose' }
+      ]
+      bulk_helper = Elasticsearch::Helpers::BulkHelper.new(CLIENT, index_slice, params)
+      bulk_helper.ingest(docs)
+      animals = CLIENT.search(index: index_slice, size: 200)['hits']['hits']
+      docs = animals.map { |animal| animal['_source'].merge({ 'id' => animal['_id'] }) }
+      docs.map { |doc| doc['scientific_name'].upcase! }
+
+      bulk_helper.update(docs, { slice: 1 }) do |response, update_docs|
+        expect(response.status).to eq(200)
+        expect(update_docs.count).to eq(1)
+      end
+
+      expect(docs.map { |doc| doc['id'] }).not_to include(nil)
+      response = CLIENT.search(index: index_slice, size: 200)
+      expect(response['hits']['hits'].map { |animal| animal['_source']['scientific_name'] }.sort)
+        .to eq(docs.map { |doc| doc['scientific_name'] }.sort)
     end
 
     it 'Deletes documents' do