Altering mapping of index without reindexing

I have an index field "Field1" of string data type. Let's call this index IND-001.
In the subsequent index IND-002, the data type/mapping of this field "Field1" has been changed to type long. This has now resulted in a conflict.
All the documents related to "Field1" have been deleted in IND-001 using DSL query. Is it possible to alter/remove the mapping of the index IND-001 without reindexing as all the docs involving the field "Field1" have now been deleted? If not, would this qualify as a worthy feature request?

It's not possible. You need to reindex.

AppSearch does that though. You can change the mapping. But behind the scene it also reindex the index.

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