Changing type for existed field

I want to know how to change type for a existed field.
But I have not found resolution.
So, I add the new field to _index as well as change from existed field name to new field name.
But, that is not able to aggregate a existed field and can't analyse existed data.
Under using the existed field, I will change a type for the existed field.

You need to reindex the data.

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