Use presenters to deliver the document url and title

app/helpers/blacklight/maps_helper.rb

@@ -23,8 +23,8 @@ def sidebar_template
       <div class='media'>
         <div class='media-body'>
           <h3 class='media-heading'>
-            <a href=\"#{document_path}\"}>
-              {#{blacklight_config.index.title_field}}
+            <a href=\"{url}\"}>
+              {title}
             </a>
           </h3>
         </div>
@@ -34,14 +34,6 @@ def sidebar_template
 
     private
 
-    ##
-    # Document path used for creating client side links to documents from a
-    # template
-    # @return String
-    def document_path
-      "#{search_catalog_path}/{#{blacklight_config.document_unique_id_param}}"
-    end
-
     ##
     # Data attributes used in displaying the index map
     # @return Hash

app/views/catalog/index.heatmaps.jbuilder

@@ -1,6 +1,11 @@
 presenter = Blacklight::JsonPresenter.new(@response, blacklight_config)
 
 json.response do
+  json.docs(presenter.documents) do |document|
+    json.url polymorphic_url(url_for_document(document))
+    json.title index_presenter(document).heading
+  end
+
   json.facet_heatmaps @response['facet_counts']['facet_heatmaps']
   json.pages presenter.pagination_info
 end