Hi Siti, we store App Search data in specialized Elasticsearch indices. Those are hidden by default and start with .ent-search. We do not recommend you touch the data in those indices, because you're likely to break key functionality in Enterprise Search and recovery can be very complicated.
If your index lifecycle policies are applied to those indices, yes, you are likely to lose data if they're deleted after 30 days. But unless you've set up ILM to specifically apply to all indices it's unlikely to apply to those indices.
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