How to change mappings of index data type from "Text" to "float"

I have part of one month data existing in old server elastic 6.8 and after re-index moved to new server 7.8.
Issues is the mapping of first part of data is showing data type which was moved from 6.8 is showing ""type": "text".
But in the latest one 7.8 the second part of data is showing data type as "type": "float".

Please suggest the ways which i can change my data type to new float type .
How to merge these two indexes without losing any data.


Is there a way i can map my old index data to the existing mapping. to resolve the above issue

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