How do I use MV_ADD to split raw strings with pipe separated values into multivalue fields?

[gesman]

I have data like this:

one_field="value_a|value_b|value_c", other_field="value_x|value_y"

How can I instruct MV_ADD to convert fields within such data to multivalue fields including auto-splitting value at '|'?

[gesman]

Apparently I don't even need MV_ADD, this solution seems to work:

Adding this to ./etc/system/local/fields.conf:

[one_field]
TOKENIZER = ([^\|]+)

[other_field]
TOKENIZER = ([^\|]+)

Ideally though I'd love to limit such transformation to specific sourcetype or index, instead of doing it globally. Not sure it's possible with fields.conf-based solution.