test/framework/src/main/java/org/elasticsearch/index/mapper/MapperTestCase.java
List<UpdateCheck> updateChecks = new ArrayList<>();
        Map<String, ConflictCheck> conflictChecks = new HashMap<>();
        /**
         * Register a check that a parameter can be updated, using the minimal mapping as a base
         *
         * @param update a field builder applied on top of the minimal mapping
         * @param check  a check that the updated parameter has been applied to the FieldMapper
         */