Making logs expire relative to the timestamp and not the indexing time(system time)

Elastic Stack Elasticsearch
1

I am using Elastic Search with a TTL for each index, and I have 1 index per
day.

Now the problem is: I get my logs to expire , say 1 day(which I specify in
the default.json) after the indexing, but what I want is the logs should
expire relative to the timestamp of the logs(which I parse and replace the
timestamp with) and not the time when the logs were indexed.

How do I do this?
Need expert help please.

Thanks

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