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Add aggregations/CCS memory leak as a 7.15.0 known issue #78729

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16 changes: 16 additions & 0 deletions docs/reference/release-notes/7.15.asciidoc
Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,22 @@

Also see <<breaking-changes-7.15,Breaking changes in 7.15>>.

[[known-issues-7.15.0]]
[discrete]
=== Known issues

* Aggregations (7.14.0-7.15.0): When a cross cluster search (CCS) request is proxied, the memory for the aggregations on the
proxy node will not be freed. The trigger is cross cluster search using aggregations where minimize
roundtrips is not effective (e.g. when minimize roundtrips is explicitly disabled, or implicitly disabled
when using scroll, async and point in time searches). This affects Kibana CCS aggregations because Kibana
uses async search by default. This issue can also happen in all modes of remote connections
configured for cross cluster search (sniff and proxy). In sniff mode, we only connect to a subset of the
remote nodes (by default 3). So if the remote node we want to send a request to is not one of those 3,
we must send the request as a proxy request. The workaround is to periodically restart nodes with heap pressure.
+
We have fixed this issue in {es} 7.15.1 and later versions. For more details,
see {es-pull}78404[#78404].

[[breaking-7.15.0]]
[float]
=== Breaking changes
Expand Down