Migrate the path hierarchy plugin to Elastic 8.18

[garaud]

Migrate the plugin for Elastic 8.18.1

• apply spotless formatting

• update the elasticsearch version to 8.18.1

• Adapt the plugin to Elastic 8

  Thanks to @nicenatalia

  Co-authored-by: Natalia Escalera [email protected]

• update the LICENSE to AGPL

• add the yaml REST test framework dependency to the build.gradle file

[Copilot]

Pull Request Overview

Migrate the path hierarchy plugin to Elastic 8.18.1 with formatting updates, version bump, and license change

• Bump Elasticsearch and plugin versions to 8.18.1 and apply spotless formatting
• Update license from MIT to AGPL and adjust README
• Refactor builder and aggregator classes to multiline argument style and remove deprecated imports

Reviewed Changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
gradle.properties	Updated es_version and plugin_version to 8.18.1
README.md	Changed license statement to AGPL
LICENSE	Replaced MIT license text with AGPL v3 full text
src/yamlRestTest/java/org/opendatasoft/elasticsearch/RestApiYamlIT.java	Added missing import for parameterized tests
src/test/java/org/opendatasoft/elasticsearch/PathHierarchyTests.java	Inlined JSON strings in test setup
src/main/java/org/opendatasoft/elasticsearch/search/aggregations/bucket/PathSortedTree.java	Removed extraneous blank lines
src/main/java/org/opendatasoft/elasticsearch/search/aggregations/bucket/*.java	Reformatted constructors and method calls to multiline style; removed deprecated imports

Comments suppressed due to low confidence (3)

src/test/java/org/opendatasoft/elasticsearch/PathHierarchyTests.java:19

• [nitpick] The variable name orders is a JSON string rather than a list; consider renaming to orderJson for clarity.

        String orders = "[{\"_key\": \"asc\"}, {\"_count\": \"desc\"}]";

src/main/java/org/opendatasoft/elasticsearch/search/aggregations/bucket/PathHierarchyAggregationBuilder.java:35

• Consider adding a unit test to verify that getMinimalSupportedVersion() returns TransportVersions.V_8_0_0 as expected.

    public TransportVersion getMinimalSupportedVersion() {

src/main/java/org/opendatasoft/elasticsearch/search/aggregations/bucket/DateHierarchyAggregationBuilder.java:149

• [nitpick] The comment references timezoneAware which is no longer a parameter; please update or remove it to avoid confusion.

        // ES 8.x introduces field validation. Setting timezoneAware to false to avoid duplication of the timezone field

[5k4nd]

@garaud I didn't manage to track the cluster info issue yet. I've added a test which is failing here and working on master (7.17.28).
The issue is: api [info] returned [405 Method Not Allowed]