Elasticsearch version 6.8.2edit
Also see Breaking changes in 6.8.
Enhancementsedit
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Machine Learning
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Improve message when native controller cannot connect #43565 (issue: #42341)
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Introduce a setting for the process connect timeout #43234
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Ranking
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Fix parameter value for calling
data.advanceExact #44205
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Snapshot/Restore
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Add SAS token authentication support to Azure Repository plugin #42982 (issue: #42117)
Bug fixesedit
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Allocation
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Do not copy initial recovery filter during an index split #44053 (issue: #43955)
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Analysis
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CCR
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Skip update if leader and follower settings are identical #44535 (issue: #44521)
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Avoid stack overflow in auto-follow coordinator #44421 (issue: #43251)
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Avoid NPE when checking for CCR index privileges #44397 (issue: #44172)
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Engine
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Preserve thread context in AsyncIOProcessor #43729
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Features/ILM
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Fix swapped variables in error message #44300
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Account for node versions during allocation in ILM shrink #43300 (issue: #41879)
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Narrow period of shrink action in which ILM prevents stopping #43254 (issue: #43253)
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Features/Indices APIs
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Features/Stats
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Return 0 for negative "free" and "total" memory reported by the OS #42725 (issue: #42157)
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Machine Learning
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Fix ML memory tracker lockup when inner step fails #44158 (issue: #44156)
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Fix datafeed checks when a concrete remote index is present #43923 (issue: #42113)
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Don’t write model size stats when job is closed without any input #512 (issue: #394)
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Don’t persist model state at the end of lookback if the lookback did not generate any input #521 (issue: #519)
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Mapping
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Prevent types deprecation warning for indices.exists requests #43963 (issue: #43905)
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Add
include_type_name in indices.exists REST API specification #43910 (issue: #43905)
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Network
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Reconnect remote cluster when seeds are changed #43379 (issue: #37799)
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SQL
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Handle the edge case of an empty array of values to return from source #43868 (issue: #43863)
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Fix NPE in case of subsequent scrolled requests for a CSV/TSV formatted response #43365 (issue: #43327)
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Increase hard limit for sorting on aggregates #43220 (issue: #43168)
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Search
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Fix wrong logic in
match_phrase query with multi-word synonyms #43941 (issue: #43308)
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Security
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Do not swallow I/O exception getting authentication #44398 (issues: #44172, #44397)
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SecurityIndexSearcherWrapper doesn’t always carry over caches and similarity #43436