Also see Breaking changes in 2.0.
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Mapping
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Deprecate
index.analysis.analyzer.default_index in favor of index.analysis.analyzer.default. #14027 (issue: #11861)
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Core
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Make PerThreadIDAndVersionLookup per-segment #14070
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Packaging
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Packaging: change permissions/ownership of config dir #14017 (issue: #11016)
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Release: Fix package repo path to only consist of major version #13971 (issue: #12493)
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Plugin Cloud GCE
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Plugins
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check "plugin already installed" before jar hell check. #14207 (issue: #14205)
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Plugin script to set proper plugin bin dir attributes #14088 (issue: #11016)
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Plugin script to set proper plugin config dir attributes #14048 (issue: #11016)
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Tribe Node
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TransportNodesAction shouldn’t hold on to cluster state #13948
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CRUD
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Send response for update request when it timed out #13101
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Engine
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Never wrap searcher for internal engine operations #14071
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Fielddata
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Add GeoPoint in StreamInput/StreamOutput #13632 (issue: #13340)
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Internal
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Properly bind ClassSet extensions as singletons #14232 (issue: #14194)
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Streamline top level reader close listeners and forbid general usage #14084
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Logging
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Settings in log config file should not overwrite custom parameters #13934
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Plugin cli tool should not create empty log files #13933
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Mapping
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Plugin Cloud AWS
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Plugins
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Parse Java system properties in plugin.bat #13989 (issue: #13616)
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PluginManager: Dont leave leftover files on unsuccessful installs #12851 (issue: #12749)
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REST
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Restore support for escaped / as part of document id #14216 (issues: #13665, #13691, #14177)
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Add missing REST spec for
detect_noop #14004
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Expose nodes operation timeout in REST API #13981
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Ensure XContent is consistent across platforms #13816
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Shadow Replicas
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Don’t pull translog from shadow engine #14000 (issue: #12730)
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Snapshot/Restore
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Snapshot restore operations throttle more than specified #13828 (issue: #6018)
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Network
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Upgrade Netty to 3.10.5.final #14105