Problem in editing @timestamp through ingest pipeline

Elastic Stack Elasticsearch
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1

Hello there.

I've been trying to manipulate @timestamp through a script in a ingest pipeline (substract 8 hours). I tried referencing @timestamp using this syntax:

ctx._source['@timestamp'] = ctx._source['@timestamp'].minusHours(8);

I used these links to come up with a solution but had no luck yet.

Is there anything I've been missing? Any comment or idea would be much appreciated.

2

Is this to convert to some timezone? Because you could use the date processor to do that.

3

Thanks for your reply.
No actually I need to manipulate the timedate itself. It's not a timezone issue in this particular scenario.