Changing a column data type results in an index that is too large. Changing the data type of column ' ' on table ' ' from ...

Changing a column data type results in an index that is too large.  Changing the data type of column '<1s>' on table '<0s>' from '<2s>' to '<3s>' causes the following indexes to exceed the maximum index size of <4d> bytes: <5s>  Do you want to proceed with the data type change and delete the indexes?