Causes for Request Timeout after 30000ms


I'm hitting this request timeout 30000ms exception sometimes (not frequent).
Query is done on local network and might return huge data over the network, does it cause the timeout?
From the ES log, GC is not running at that time.

May I know what are the possible causes for the timeout?

I have a node with below specifications
30GB heap
10 shards
1 replica
monthly indexing
~450GB documents/month

Thanks in advance.

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