Ingest Kafka csv files cell by cell

Question

I have this csv structure dataset:

	S1	S2	...	Sm
A1	1.6	2.4	...	0.5
A2	1.8	0.1	...	3.2
..	...	...	...	...
An	0.3	4.1	...	2.6

I want ingest a document for each cell in the csv like this to be ingested in kafka:

{ "sample_id": "Sm" "attribute:_id": "An" "expression": 2.6 }

This files have a size from 1Mb to 700Mb aprox.

What will be the best option to ingest this csv files in kafka to be indexed later in elasticsearch?