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Better description of real-memory breaker changes to aggs (#57306) 

The old description mentions a setting that we ended up not merging.
The periodic real-memory checks are automatic and do not require
the user to configure any setting.
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Zachary Tong 2020-06-01 14:58:20 -04:00 committed by GitHub
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docs/reference/release-notes/highlights-7.7.0.asciidoc
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@ -86,11 +86,10 @@ therefore helps interpret these results.
[float]
=== Finer memory control for bucket aggregations
We introduced a new `search.check_buckets_step_size` setting to
better control how the coordinating node allocates memory when aggregating
buckets. The allocation of buckets is now be done in steps, each step
allocating a number of buckets equal to this setting. To avoid an `OutOfMemory`
error, a parent circuit breaker check is performed on allocation.
While building buckets, aggregations will now periodically check the
real-memory circuit breaker before continuing to allocate more buckets. This
allows better responsivity to memory pressure and avoids `OutOfMemory`
situations due to allocating more buckets than the node can handle.
// end::notable-highlights[]