RUBY-1163 Fix creating indexes on subdocument fields in server < 2.6

Author: estolfo

lib/mongo/operation/write/create_index.rb

@@ -59,7 +59,7 @@ def index_documents
         end
 
         def message
-          Protocol::Insert.new(db_name, Index::COLLECTION, index_documents)
+          Protocol::Insert.new(db_name, Index::COLLECTION, index_documents, validating_keys: false)
         end
       end
     end

lib/mongo/protocol/insert.rb

@@ -54,6 +54,7 @@ def initialize(database, collection, documents, options = {})
         @documents = documents
         @flags = options[:flags] || []
         @upconverter = Upconverter.new(collection, documents, options)
+        @options = options
       end
 
       # Return the event payload for monitoring.
@@ -76,7 +77,7 @@ def payload
       private
 
       def validating_keys?
-        true
+        @options.fetch(:validating_keys, true)
       end
 
       attr_reader :upconverter

spec/mongo/index/view_spec.rb

@@ -141,12 +141,31 @@
       end
 
       after do
-        view.drop_one('random_1')
+        begin; view.drop_one('random_1'); rescue; end
       end
 
       it 'returns ok' do
         expect(result).to be_successful
       end
+
+      context 'when the index is created on an subdocument field' do
+
+        let(:spec) do
+          { 'sub_document.random' => 1 }
+        end
+
+        let(:result) do
+          view.create_one(spec, unique: true)
+        end
+
+        after do
+          begin; view.drop_one('sub_document.random_1'); rescue; end
+        end
+
+        it 'returns ok' do
+          expect(result).to be_successful
+        end
+      end
     end
 
     context 'when index creation fails' do