[Pipeline] to rename column name of doc before indexing

Hi Team ,

We want to rename column name of doc before indexing.
Please find below example :

before index

in above example we have tag.customer_id column name and we want to rename it to customerID before indexing doc as below.

after rename

in future data will come as tag.customer_id but it should index as customerID

Please suggest how to use pipeline for this.

Thanks & Regards,
Jalpesh