Circuit Breaker limit definition question

Elastic Stack Elasticsearch
1

I have read https://www.elastic.co/guide/en/elasticsearch/guide/current/_limiting_memory_usage.html and understood what is curcuit breaker. But the meaning of the curcuit breaker settings such as indices.breaker.total.limit is still unclear to me. Is this a limit of estimated memory usage of a single incoming query, or it's the limit of the current memory usage plus the estimated memory usage of the incoming query?

2

The total circuit breaker wraps the request and fielddata circuit breakers to ensure that the combination of the two doesn’t use more than 70% of the heap by default.

It's the incoming request and also the existing (fielddata) cache.

3

Thanks but that's not what I was asking. I meant:
indices.breaker.fielddata.limit = existing field data memory + estimated new field data memory requirement
or
indices.breaker.fielddata.limit = estimated new field data memory requirement
?

4

This one.

5

OK, thanks!