* Support Elasticsearch v9 alongside v8
* Add CI workflow changes for Elasticsearch v8/v9 testing
* Support Elasticsearch v7 in addition to v8/v9, add v7 CI test job
Lowers the minimum supported ES version from 8 to 7 to avoid dropping
v7 support in a dot release. Adds a dedicated CI job to verify v7
compatibility alongside the existing v8 and v9 (default) jobs.
* Fix ES7 plugin install crash on cgroup v2 hosts
* Fix ES 7 container startup on cgroup v2 Linux (GitHub Actions)
ES 7 bundles JDK 11, which crashes with a NullPointerException in
CgroupV2Subsystem.getMountPoint() on modern Linux kernels that use
cgroup v2 (including GitHub Actions ubuntu-latest runners). The flag
was already set during the Dockerfile RUN step, but not at runtime.
Adding -XX:-UseContainerSupport to ES_JAVA_OPTS in docker-compose
fixes the crash. The flag is harmless on ES 8/9 which ship JDK 17+
where the cgroup v2 bug is fixed (it simply opts out of container-aware
JVM sizing).
* Capture docker compose logs in CI test artifact
* Use ES 7.17.29 for v7 CI test; remove cgroup v2 workarounds
ES 7.17.0 bundled JDK 17.0.1 which had a cgroup v2 bug
(CgroupV2Subsystem NPE) not fixable via -XX:-UseContainerSupport.
ES 7.17.29 bundles JDK 22 where the bug is long fixed.
Reverts the -XX:-UseContainerSupport workarounds added in the
previous two commits as they were based on a wrong diagnosis
and are no longer needed.
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Co-authored-by: Mattermost Build <build@mattermost.com>
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