how to move index to another tablespace without rebuild

I have a partitioned index and I need to move it to another tablespace.

I tried

alter index user1.table1_pk
modify default attributes for partition year_2000 tablespace indx;

ERROR at line 1:
ORA-14288: index is not partitioned by Composite Range method

Then I tried

alter index rtms.HISTORICAL_RTMS_PK
modify partition year_2000
tablespace indx;

ERROR at line 3:
ORA-14050: invalid ALTER INDEX MODIFY PARTITION option

Do I really have to rebuild it? It is such a huge index.

Thanks for your help.  

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