Elasticsearch version 6.8.4
edit Also see Breaking changes in 6.8.
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Engine
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Limit number of retaining translog files for peer recovery #47414
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Infra/Settings
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Add more meaningful keystore version mismatch errors #46291 (issue: #44624)
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Machine Learning
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Throttle the delete-by-query of expired results #47177 (issues: #47003)
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Authentication
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Fallback to realm authc if ApiKey fails #46538
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CRUD
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Do not use ifSeqNo if doc does not have seq_no #46198
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Distributed
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Fix false positive out of sync warning in synced-flush #46576 (issues: #28464, #30244)
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Suppress warning logs from background sync on relocated primary #46247 (issues: #40800, #42241)
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Engine
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Features/Indices APIs
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Fix Rollover error when alias has closed indices #47839 (issue: #47148)
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Features/Ingest
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Allow dropping documents with auto-generated ID #46773 (issue: #46678)
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Features/Watcher
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Watcher - workaround for potential deadlock #47603 (issues: #41451, #47599)
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Fix class used to initialize logger in Watcher #46467
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Machine Learning
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Reinstate ML daily maintenance actions #47103 (issue: #47003)
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Fix two datafeed flush lockup bugs #46982
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Throw an error when a datafeed needs CCS but it is not enabled for the node #46044
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Fix possibility of crash when calculating forecasts that overflow to disk #688
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SQL
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SQL: Allow whitespaces in escape patterns #47577 (issue: #47401)
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SQL: Fix issue with common type resolution #46565 (issue: #46551)
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SQL: wrong number of values for columns #42122
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Snapshot/Restore
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Fix Bug in Azure Repo Exception Handling #47968
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Fix Snapshot Corruption in Edge Case #47552 (issues: #46250, #47550)
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Fix TransportSnapshotsStatusAction ThreadPool Use #45824
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Engine
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Upgrade to lucene 7.7.2 #47901