Index displayed date, hide date created from manifest

app/schemas/plum_schema.rb

@@ -19,6 +19,7 @@ class PlumSchema < ActiveTriples::Schema
 
   # Generated from Context
   property :coverage, predicate: RDF::Vocab::DC11.coverage
+  property :display_date, predicate: RDF::Vocab::DC11.date
   property :format, predicate: RDF::Vocab::DC11.format
   property :source, predicate: RDF::Vocab::DC11.source
   property :extent, predicate: RDF::Vocab::DC.extent

app/services/manifest_builder/metadata_builder.rb

@@ -23,7 +23,7 @@ def metadata_objects
       end
 
       def metadata_fields
-        PlumSchema.display_fields + [:exhibit_id, :collection] - [:has_model]
+        PlumSchema.display_fields + [:exhibit_id, :collection] - [:has_model, :date_created]
       end
 
       class MetadataObject

spec/services/polymorphic_manifest_builder_spec.rb

@@ -315,10 +315,6 @@ def build_file_set(id)
         record.ocr_language = ["test"]
         expect(result.metadata.first).to be_nil
       end
-      it "has a date created" do
-        record.date_created = ["1981-01-31"]
-        expect(result.metadata).not_to be_empty
-      end
     end
     describe "a record in a collection" do
       let(:resource) { FactoryGirl.create(:scanned_resource_in_collection) }