Fixed bug in how the JSON was being escaped for facet values

fields.json

@@ -26,7 +26,7 @@
         "facet": true
       },
 
-      "creator": {
+      "author": {
         "resolve": "multi",
         "facet": true
       },

lib/CatalogSolr.js

@@ -267,7 +267,7 @@ class CatalogSolr {
     if( !resolved ) {
       return this.convertError(`@id ${value['@id']} not found`);
     }
-    return JSON.stringify(resolved).replace(/"/g, '\'');    
+    return JSON.stringify(resolved).replace(/"/g, '\"');    
   }
 
   // returns