About the test of indicators.breaker.total.limit parameters

I want to test the test cluster. I want to see what the threshold of the indices.breaker.total.limit parameter is set to, the cluster can reject the request to ensure that it does not crash. So 20 requests were issued at the same time, and each request was aggregated 50 times in seconds (I wrote a for loop). But the final result is: when I set the threshold to 50%, the data node of the cluster still crashes? Is there a problem with my test method? Thank you very much for advice.

Let me rephrase what I mean,So 20 requests were issued at the same time,and each request was:Aggregate in seconds based on time, and loop 50 times(it means 20*50=1000 requests)