Also see Breaking changes in 5.0.
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Core
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Install a security manager on startup #21716
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Exceptions
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Logging
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Scripting
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Wrap VerifyError in ScriptException #21769
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Snapshot/Restore
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Abort snapshots on a node that leaves the cluster #21084 (issue: #20876)
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Allocation
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Allow master to assign primary shard to node that has shard store locked during shard state fetching #21656 (issue: #19416)
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Cluster
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Remove cluster update task when task times out #21578 (issue: #21568)
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Core
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Add a StreamInput#readArraySize method that ensures sane array sizes #21697
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Use a buffer to do character to byte conversion in StreamOutput#writeString #21680 (issue: #21660)
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Engine
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Die with dignity on the Lucene layer #21721 (issue: #19272)
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Fix
InternalEngine#isThrottled to not always return false. #21592
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Index Templates
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Fix integer overflows when dealing with templates. #21628 (issue: #21622)
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Ingest
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fix trace_match behavior for when there is only one grok pattern #21413 (issue: #21371)
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Internal
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Rethrow ExecutionException from the loader to concurrent callers of Cache#computeIfAbsent #21549
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Fixes potential NullPointerException on shard closing #21515 (issue: #21084)
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Java API
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Transport client: Fix remove address to actually work #21743
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Add a HostFailureListener to notify client code if a node got disconnected #21709 (issue: #21424)
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Logging
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Network
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Die with dignity on the network layer #21720 (issue: #19272)
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Plugin Lang Painless
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Fix a VerifyError bug in Painless #21765
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Fix Lambdas in Painless to be Able to Use Top-Level Variables Such as params and doc #21635 (issues: #20869, #21479)
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Search
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Settings
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Don’t reset non-dynamic settings unless explicitly requested #21646 (issue: #21593)
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Tribe Node
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