code: private Map<String, Object> removeUnusedMapEntries(
              AtlasVertex instanceVertex, String propertyName,
              Map<String, Object> currentMap,
              Map<String, Object> newMap, IDataType elementType,
              AttributeInfo attributeInfo)
                      throws AtlasException {
  
          Map<String, Object> additionalMap = new HashMap<>();
          for (String currentKey : currentMap.keySet()) {
  
              boolean shouldDeleteKey = !newMap.containsKey(currentKey);
              if (GraphHelper.isReference(elementType)) {
  
                  //Delete the edge reference if its not part of new edges created/updated
                  AtlasEdge currentEdge = (AtlasEdge)currentMap.get(currentKey);
  
                  if (!newMap.values().contains(currentEdge)) {
  
                      boolean deleted =
                              deleteHandler.deleteEdgeReference(currentEdge, elementType.getTypeCategory(), attributeInfo.isComposite, true);
                      if (!deleted) {
                          additionalMap.put(currentKey, currentEdge);
                          shouldDeleteKey = false;
                      }
                  }
              }
  
              if (shouldDeleteKey) {
                  String propertyNameForKey = GraphHelper.getQualifiedNameForMapKey(propertyName, currentKey);
                  GraphHelper.setProperty(instanceVertex, propertyNameForKey, null);
              }
          }
          return additionalMap;
      }
docs: Remove unused entries from map