Track changes in Logstash

How to come from data in 1 to data in 2? Note that the col1 is continuous.
col1
2.3
2.3
2.3
5.7
5.7
6.1
6.1
....
..
.

I want to achieve this:
col1 | col2
2.3 | 1
2.3 |1
2.3 |1
5.7 |2
5.7 |2
6.1 |3
6.1 |3
....
..
.

Hi @Felicien_Ihirwe,

Can you give a bit more detail on what transform based on col1 that you're trying to do. Are you wanting to add a new field col2 that is an identifier of the value?

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