code: @Procedure(mode = Mode.WRITE)
  	@Description("apoc.refactor.rename.type(oldType, newType, [rels]) | rename all relationships with type 'oldType' to 'newType'. If 'rels' is provided renaming is applied to this set only")
  	public Stream<BatchAndTotalResultWithInfo> type(@Name("oldType") String oldType, @Name("newType") String newType, @Name(value = "rels", defaultValue = "") List<Relationship> rels) {
  		String cypherIterate = rels != null && ! rels.isEmpty() ? "UNWIND {rels} AS oldRel WITH oldRel WHERE type(oldRel)=\""+oldType+"\" RETURN oldRel,startNode(oldRel) as a,endNode(oldRel) as b" : "MATCH (a)-[oldRel:`"+oldType+"`]->(b) RETURN oldRel,a,b";
  		String cypherAction = "CREATE(a)-[newRel:`"+newType+"`]->(b)"+ "SET newRel+=oldRel DELETE oldRel";
  		Map<String, Object> parameters = MapUtil.map("batchSize", 100000, "parallel", true, "iterateList", true, "params", MapUtil.map("rels", rels));
  		return getResultOfBatchAndTotalWithInfo(newPeriodic().iterate(cypherIterate, cypherAction, parameters), db, null, oldType, null);
  	}
docs: Rename the Relationship Type by creating a new one and deleting the old.