UNOMI-921: Replace elasticsearch-maven-plugin with Docker-based Elasticsearch in integration tests

[sergehuber]

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Role	Branch
Base (merge into)	master
Head (this PR)	UNOMI-itests-es-docker

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JIRA: https://issues.apache.org/jira/browse/UNOMI-921 — Replace elasticsearch-maven-plugin with Docker-based Elasticsearch Instance in integration tests.

Why this change

The elasticsearch profile in itests/pom.xml currently uses com.github.alexcojocaru:elasticsearch-maven-plugin to download an Elasticsearch tarball and run it as a forked JVM during the Maven build. This approach:

• requires downloading Elasticsearch binaries during the build,
• creates a default_template that overrides user templates on ES 8/9 — currently worked around by BaseIT.fixDefaultTemplateIfNeeded(),
• is inconsistent with the opensearch profile (same itests/pom.xml), which already uses Docker, and
• has a more complex lifecycle to manage.

Aligning Elasticsearch on the same Docker-based approach the opensearch profile uses removes the template-override workaround, eliminates the binary download, and makes both search-engine profiles symmetric.

What changed

itests/pom.xml — elasticsearch profile

• Add <elasticsearch.port>9400</elasticsearch.port> and surface it to Failsafe via systemPropertyVariables, so tests resolve the HTTP port from a single property (value unchanged: 9400).
• Replace the elasticsearch-maven-plugin execution with an io.fabric8:docker-maven-plugin execution running:
  • Image: docker.elastic.co/elasticsearch/elasticsearch:${elasticsearch.test.version}
  • Port mapping: container 9200 → host 9400
  • Heap: -Xms8g -Xmx8g — aligned with OpenSearch and the ES 9 sizing guidance (was 4g)
  • Settings: discovery.type=single-node, cluster.default.index.settings.number_of_replicas=0, xpack.ml.enabled=false, xpack.security.enabled=false, cluster.routing.allocation.disk.threshold_enabled=false, path.repo=/tmp/snapshots_repository
  • Volume bind: ${project.build.directory}/snapshots_repository → /tmp/snapshots_repository
  • HTTP wait probe before the integration-test phase
• Container lifecycle matches the OpenSearch profile exactly: pre-integration-test runs stop + remove (idempotent cleanup) then start with showLogs; post-integration-test runs stop only — the container is kept around (not removed) so logs can be inspected after a failed run.
• Add chmod -R ugo+rwx on target/snapshots_repository in the antrun unzip step. The official ES image runs as UID 1000, so on Linux CI the bind-mounted snapshot repository otherwise hits access_denied during repository verify operations.

pom.xml (root)

• Declare <docker-maven-plugin.version>0.48.0</docker-maven-plugin.version> and add the corresponding <pluginManagement> entry so the elasticsearch profile (and any future user of the plugin) inherits a single version.

Verification

• mvn -P integration-tests,elasticsearch -DskipITs=false verify on itests: container starts on 9400, all integration tests run against it, container is stopped (but not removed) after the run.
• Container is visible via docker ps -a --filter name=unomi-itests-elasticsearch after the run; logs accessible via docker logs.

Follow-ups (tracked under the same JIRA)

These items are part of UNOMI-921 but are kept out of this PR to keep the diff strictly limited to the build-infrastructure swap. They will land in a follow-up PR:

• Remove BaseIT.fixDefaultTemplateIfNeeded() and its call in checkSearchEngine() (now dead code under Docker).

• Migrate16xToCurrentVersionIT: replace the hardcoded ES_BASE_URL = "http://localhost:9400" with the dynamic getSearchPort() resolution.

• Drop the comments referring to the elasticsearch-maven-plugin template-override workaround.

• I hereby declare this contribution to be licenced under the Apache License Version 2.0, January 2004

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