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Release notes for 7.16.0 (#13436)

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Co-authored-by: Karol Bucek <kares@users.noreply.github.com>
Co-authored-by: João Duarte <jsvd@users.noreply.github.com>
Co-authored-by: Karen Metts <35154725+karenzone@users.noreply.github.com>
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This section summarizes the changes in the following releases:
* <<logstash-7-16-0,Logstash 7.16.0>>
* <<logstash-7-15-2,Logstash 7.15.2>>
* <<logstash-7-15-1,Logstash 7.15.1>>
* <<logstash-7-15-0,Logstash 7.15.0>>
@ -54,6 +55,99 @@ This section summarizes the changes in the following releases:
* <<logstash-7-0-0-alpha2,Logstash 7.0.0-alpha2>>
* <<logstash-7-0-0-alpha1,Logstash 7.0.0-alpha1>>
[[logstash-7-16-0]]
=== Logstash 7.16.0 Release Notes
[[notable-7-16-0]]
==== Performance improvements and notable issues fixed
* Add `pipeline.ordered` setting for docker image https://github.com/elastic/logstash/pull/13300[#13300]
**Updates to dependencies**
* Update JRuby to 9.2.20.1 https://github.com/elastic/logstash/pull/13468[#13468]
[[deprecated-7-16-0]]
==== Deprecations
* Java 8 has been deprecated. Logstash 8.0 will remove support for Java versions before 11.
* Logstash will no longer support the use of the `JAVA_HOME` environment variable in 8.0, and will use the bundled JDK instead. If you need to use a different version, use the `LS_JAVA_HOME` environment variable.
* Reminder: The Ruby Execution Engine is deprecated and will not be available in Logstash 8.
The Java Execution Engine has been the default since 7.0 and reached substantial maturity in 7.10.
[[featured-7-16-0]]
==== New features and enhancements
* Added options for securing the Logstash HTTP API using TLS and/or HTTP Basic auth https://github.com/elastic/logstash/pull/13308[#13308].
We're planning to follow up on the feature set shipped in 7.16. For details please see https://github.com/elastic/logstash/issues/13196[#13196].
* Opting in to ECS compatibility per-pipeline (`pipeline.ecs_compatibility`) or globally has graduated from BETA and is general available (GA).
* Introduce `LS_JAVA_HOME` environment variable to replace `JAVA_HOME` https://github.com/elastic/logstash/pull/13204[#13204].
- Until 8.0, Logstash looks for `JAVA_HOME` if `LS_JAVA_HOME` is not specified. (See <<deprecated-7-16-0>>.)
- We recommend using the bundled JDK unless you have a compelling reason to use a different one.
* Logstash added tests against Java 17 and started supporting JDK 17 https://github.com/elastic/logstash/pull/13330[#13330]
The complete list of supported operating systems and JVMs is available in the
https://www.elastic.co/support/matrix[support matrix].
[[ecs-7-16-0]]
===== Progress toward Elastic Common Schema (ECS)
In this release, we continued our efforts towards Elastic Common Schema (ECS):
* <<plugins-inputs-elasticsearch,elasticsearch input>> has sensible defaults with `ecs_compatibility`
* <<plugins-inputs-http_poller,http_poller input>> leverages ECS fields under `ecs_compatibility`
* <<plugins-codecs-avro,avro codec>> added `target` support
* <<plugins-codecs-es_bulk,ES bulk codec>> added `target` support
Check out our https://github.com/elastic/logstash/issues/11635[progress toward ECS compatibility] in github issue https://github.com/elastic/logstash/issues/11635[#11635].
[[plugins-7-16-0]]
==== Plugins
*Avro Codec - 3.3.0*
* Add ECS support. Add target option and event.original https://github.com/logstash-plugins/logstash-codec-avro/pull/36[#36]
*Es_bulk Codec - 3.1.0*
* Add ECS support. Add `target` option https://github.com/logstash-plugins/logstash-codec-es_bulk/pull/20[#20]
*Aggregate Filter - 2.10.0*
* Feat: add ability to generate new event during code execution https://github.com/logstash-plugins/logstash-filter-aggregate/pull/116[#116]
*Elasticsearch Filter - 3.11.0*
* Feat: update Elasticsearch client to 7.14.0 https://github.com/logstash-plugins/logstash-filter-elasticsearch/pull/150[#150]
* Feat: add user-agent header passed to the Elasticsearch HTTP connection https://github.com/logstash-plugins/logstash-filter-elasticsearch/pull/152[#152]
*Azure_event_hubs Input - 1.4.0*
* Updated the minor version of Azure SDK and other dependencies to ensure users of this plugin get upstream fixes and improvements https://github.com/logstash-plugins/logstash-input-azure_event_hubs/pull/67[#67]
*Elasticsearch Input - 4.12.1*
* Fixed too_long_frame_exception by passing scroll_id in the body https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/159[#159]
* Feat: Update Elasticsearch client to 7.14.0 https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/157[#157]
* Feat: add user-agent header passed to the Elasticsearch HTTP connection https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/158[#158]
* Feat: added ecs_compatibility + event_factory support https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/149[#149]
*Http_poller Input - 5.1.0*
* Add ECS support https://github.com/logstash-plugins/logstash-input-http_poller/pull/129[#129]
*Elasticsearch Output - 11.2.1*
* Fix referencing Gem classes from global lexical scope https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1044[#1044]
* Added preflight checks on Elasticsearch https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1026[#1026]
* Feat: add `user-agent` header passed to the Elasticsearch HTTP connection https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1038[#1038]
[[logstash-7-15-2]]
=== Logstash 7.15.2 Release Notes