Elasticsearch X-Pack 6.0.0-rc2 Release Notes

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Machine Learning

Added the xpack.ml.max_model_memory_limit setting, which can be dynamically updated. For more information, see Machine Learning Settings.
Added checks and error messages for the ml.enabled and ml.max_open_jobs node attributes. These are reserved for internal use and their values should be set by using xpack.ml.enabled and xpack.ml.max_open_jobs machine learning settings.

Security

Watcher

Added verification that the required templates exist before Watcher starts. For more information, see Scripts and Templates.
Added the xpack.watcher.history.cleaner_service.enabled setting. You can use this setting to enable or disable the cleaner service, which removes previous versions of Watcher indices (for example, .watcher-history*) when it determines that they are old. For more information, see Watcher Settings.

Machine Learning

Fixed a scenario where models were incorrectly combined. This problem occurred when anomaly detectors were considered to be the same despite having different partition field values.
Cleaned up the job closure process for situations where the job was still in the process of opening.

Security

Enabled PKI realms to obtain the password for the truststore from either the truststore.secure_password or the truststore.password setting. For more information, see PKI Realm Settings.
Fixed document level security such that if your role has authority to access a root document, you also have access to its nested documents.
Fixed an issue that caused LDAP authentication requests to be slow and to require multiple binds when authenticating in user search mode.