Rename transformation in projection

src/main/java/org/gcube/application/geoportal/common/model/rest/QueryRequest.java

@@ -22,7 +22,7 @@ public class QueryRequest {
         private List<String> fields;
     }
     private Document filter;
-    private Document transformation;
+    private Document projection;
     private OrderedRequest ordering;
     private PagedRequest paging;
 }