[PR] Support Elasticsearch 9.x as storage [skywalking]

["kezhenxu94 (via GitHub)" <gi...@apache.org>]

kezhenxu94 opened a new pull request, #13957:
URL: https://github.com/apache/skywalking/pull/13957

   ### Fix the issue
   
   Adds support for running SkyWalking OAP against **Elasticsearch 9.x** as storage.
   
   ### Why
   
   The in-tree ES client (`library-elasticsearch-client`) selects its request factory / codec per server version in `ElasticSearchVersion`. The ceiling was `major == 8`, so any server reporting major version 9 fell through to `UnsupportedOperationException("Unsupported version")` and OAP refused to start against an Elasticsearch 9 cluster.
   
   ES 9 keeps the same REST surface the ES 8 path already relies on — typeless document writes (`POST /{index}/_update/{id}`) and composable index templates (`PUT /_index_template/{name}`) — so no new factory or codec is needed; the version gate just needs to admit major >= 8. This mirrors how OpenSearch is already handled version-agnostically.
   
   ### What changed
   
   - `ElasticSearchVersion`: `if (major == 8)` → `if (major >= 8)` for the ElasticSearch distribution (8.x, 9.x and later use the existing typeless-doc + composable-template path).
   - `ElasticSearchIT`: add an `ElasticSearch 9.3.0` parameter (all IT methods run against a real ES 9 container).
   - CI `skywalking.yaml`: add a `Storage ES 9.3.0` e2e case alongside the existing `8.18.8`.
   - Docs: storage doc supported-versions line now lists ElasticSearch 9.x; changelog entry added.
   
   Verified locally against a real `elasticsearch:9.3.0` container: version detection, composable index template, typeless index/get/update/delete, and search all behave as expected.
   
   - [x] Update the [`CHANGES` log](https://github.com/apache/skywalking/blob/master/docs/en/changes/changes.md).


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Re: [PR] Support Elasticsearch 9.x as storage [skywalking]

["kezhenxu94 (via GitHub)" <gi...@apache.org>]

kezhenxu94 merged PR #13957:
URL: https://github.com/apache/skywalking/pull/13957


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