func getMapAndMergeKeyValueByIndex(index int, mergeKey string, listOfMaps []interface{}) (map[string]interface{}, interface{}, error) {
	m, ok := listOfMaps[index].(map[string]interface{})
	if !ok {
		return nil, nil, mergepatch.ErrBadArgType(m, listOfMaps[index])
	}

	val, ok := m[mergeKey]
	if !ok {
		return nil, nil, mergepatch.ErrNoMergeKey(m, mergeKey)
	}