Add known issue for PipelineBusv2 to 8.15.x release notes (#16661)

* Add Known Issue for 8.15.x releases and PipelineBusV2

https://github.com/elastic/logstash/issues/16657

* Sync 8.15.4 with others

* Apply suggestions from code review

Co-authored-by: Karen Metts <35154725+karenzone@users.noreply.github.com>

* Propagate suggestions to other entries

* Apply suggestions from code review

formatting:
- plus-to-continue only in lists,
- consistency of linebreaks before next section

Co-authored-by: Karen Metts <35154725+karenzone@users.noreply.github.com>

---------

Co-authored-by: Karen Metts <35154725+karenzone@users.noreply.github.com>
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@ -72,6 +72,14 @@ This section summarizes the changes in the following releases:
[[logstash-8-15-4]]
=== Logstash 8.15.4 Release Notes
[[known-issues-8-15-4]]
==== Known issue
**{ls} can fail to shut down under some circumstances when you are using <<pipeline-to-pipeline>>.**
Check out issue https://github.com/elastic/logstash/issues/16657[#16657] for details.
Workaround: Add `-Dlogstash.pipelinebus.implementation=v1` to `config/jvm.properties`.
This change reverts the `PipelineBus` to `v1`, a version that does not exhibit this issue, but may impact performance in pipeline-to-pipeline scenarios.
[[notable-8.15.4]]
==== Notable issues fixed
@ -112,6 +120,14 @@ This section summarizes the changes in the following releases:
* Fixed Logstash core compatibility issues with `logstash-input-azure_event_hubs` versions `1.4.8` and earlier https://github.com/elastic/logstash/pull/16485[#16485]
[[known-issues-8-15-3]]
==== Known issue
**{ls} can fail to shut down under some circumstances when you are using <<pipeline-to-pipeline>>.**
Check out issue https://github.com/elastic/logstash/issues/16657[#16657] for details.
Workaround: Add `-Dlogstash.pipelinebus.implementation=v1` to `config/jvm.properties`.
This change reverts the `PipelineBus` to `v1`, a version that does not exhibit this issue, but may impact performance in pipeline-to-pipeline scenarios.
==== Plugins
*Elastic_integration Filter - 0.1.14*
@ -137,6 +153,14 @@ This section summarizes the changes in the following releases:
* Fixed a https://github.com/elastic/logstash/issues/16437[regression] from {ls} 8.15.1 in which {ls} removes all quotes from docker env variables, possibly causing {ls} not to start https://github.com/elastic/logstash/pull/16456[#16456]
[[known-issues-8-15-2]]
==== Known issue
**{ls} can fail to shut down under some circumstances when you are using <<pipeline-to-pipeline>>.**
Check out issue https://github.com/elastic/logstash/issues/16657[#16657] for details.
Workaround: Add `-Dlogstash.pipelinebus.implementation=v1` to `config/jvm.properties`.
This change reverts the `PipelineBus` to `v1`, a version that does not exhibit this issue, but may impact performance in pipeline-to-pipeline scenarios.
==== Plugins
*Beats Input - 6.8.4*
@ -172,6 +196,12 @@ If this situation occurs, {ls} may fail to start or some plugins may use a malfo
Check out issue https://github.com/elastic/logstash/issues/16437[#16437] for details.
+
Workaround: Downgrade to {ls} 8.15.0, or temporarily avoid using environment and keystore variable references.
* **{ls} can fail to shut down under some circumstances when you are using <<pipeline-to-pipeline>>.**
Check out issue https://github.com/elastic/logstash/issues/16657[#16657] for details.
+
Workaround: Add `-Dlogstash.pipelinebus.implementation=v1` to `config/jvm.properties`.
This change reverts the `PipelineBus` to `v1`, a version that does not exhibit this issue, but may impact performance in pipeline-to-pipeline scenarios.
[[notable-8.15.1]]
==== Performance improvements and notable issues fixed
@ -206,6 +236,14 @@ Workaround: Downgrade to {ls} 8.15.0, or temporarily avoid using environment and
[[logstash-8-15-0]]
=== Logstash 8.15.0 Release Notes
[[known-issues-8-15-0]]
==== Known issue
**{ls} can fail to shut down under some circumstances when you are using <<pipeline-to-pipeline>>.**
Check out issue https://github.com/elastic/logstash/issues/16657[#16657] for details.
Workaround: Add `-Dlogstash.pipelinebus.implementation=v1` to `config/jvm.properties`.
This change reverts the `PipelineBus` to `v1`, a version that does not exhibit this issue, but may impact performance in pipeline-to-pipeline scenarios.
[[snmp-ga-8.15.0]]
==== Announcing the new {ls} SNMP integration plugin
@ -2579,4 +2617,4 @@ We have added another flag to the Benchmark CLI to allow passing a data file wit
This feature allows users to run the Benchmark CLI in a custom test case with a custom config and a custom dataset. https://github.com/elastic/logstash/pull/12437[#12437]
==== Plugin releases
Plugins align with release 7.14.0
Plugins align with release 7.14.0