* Remove `es-test-dir` book-scoped variable
* Remove `plugins-examples-dir` book-scoped variable
* Remove `:dependencies-dir:` and `:xes-repo-dir:` book-scoped variables
- In `index.asciidoc`, two variables (`:dependencies-dir:` and `:xes-repo-dir:`) were removed.
- In `sql/index.asciidoc`, the `:sql-tests:` path was updated to fuller path
- In `esql/index.asciidoc`, the `:esql-tests:` path was updated idem
* Replace `es-repo-dir` with `es-ref-dir`
* Move `:include-xpack: true` to few files that use it, remove from index.asciidoc
* isSafeToShutdown checks routing table
* Rebalancer changes and tests
* Update docs/changelog/98406.yaml
* Forcing lifecycle tests to avoid over time case
* Changes and remaining tests
* Adding node service changes
* Finishing unit tests
* Adding wait for completion paramater
* Adding stop deployment integration tests
* Cleaning up code
* Fixing stop deployment test
* Fixing string formatter issue and timeout
* Investigating deadlock
* More testing
* More logging
* Prevent model reloading while stopping
* Fixing compile error
* More code clean up
* Adding test for loading model after stopping
* Addressing review feedback
* Fixing a couple shutdown -> shutdownNow tests
* Adding doc changes and refactoring
This adds model_alias support for native pytorch models.
Model aliases can be used in `_infer` or within the inference processor. This way the alias can be atomically changed without down time to another deployed model.
Restrictions:
- Model alias changes need to be done between two models of the same kind (e.g. pytorch -> pytorch)
- Model alias change is not allowed between a model that is deployed to a model that is not
- Model alias change is not allowed between a model that deployed AND allocated to a model that is deployed but NOT allocated (not assigned to any nodes).
- A deployment cannot be stopped (without supplying the `force` parameter) when the model has a model alias that is used by a pipeline.
closes: https://github.com/elastic/elasticsearch/issues/90960
