Performance of elasticsearch indexing logs continuously

Hello, I configure generator input to generate logs and sent them to
elasticsearch by logstash.

At the beginning of elasticsearch start working, the number of events can
reach to 20000 events/sec into es. But over time, it becomes less and less.
And on 8:00 everyday When logstash creat a new index into es automaticly,
it will repeat this phenomenon. Does somebody know the reason for it? How
can I optimize elasticsearch and make it steady index 20000 events/s all
the time within a day?

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