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Elasticsearch version 6.1.3

Elasticsearch version 6.1.3

Bug Fixes

Engine

Replica recovery could go into an endless flushing loop #28350

Internal

Never return null from Strings.tokenizeToStringArray #28224 (issue: #28213)
Fallback to TransportMasterNodeAction for cluster health retries #28195 (issue: #28169)

Mapping

Allow update of eager_global_ordinals on _parent. #28014 (issue: #24407)

Scripting

Ensure we protect Collections obtained from scripts from self-referencing #28335

Security

Improved cache expiry handling in the token service. Previously, if the token service was idle for more than 60 minutes, the key expired and the service failed to generate user tokens.

Settings

Fix setting notification for complex setting (affixMap settings) that could cause transient settings to be ignored #28317 (issue: #28316)
Fix environment variable substitutions in list setting #28106 (issue: #27926)

Snapshot/Restore

Avoid concurrent snapshot finalizations when deleting an INIT snapshot #28078 (issues: #27214, #27931, #27974)
Do not start snapshots that are deleted during initialization #27931

Watcher

Fixed a null pointer exception in the TemplateRegistry when there is no master node available.
Ensured collections obtained from scripts are protected from self-referencing. See https://github.com/elastic/elasticsearch/pull/28335.

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