Also see Breaking changes in 2.2.
Enhancementsedit
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Cluster
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Shard state action request logging #16396
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Core
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Avoid cloning MessageDigest instances #16479
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Exceptions
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Add Exception class name to message in
NotSerializableExceptionWrapper #16325
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Network
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Add additional fallback to http.publish_port and restrict fallback to transport.publish_port #16626 (issue: #14535)
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Packaging
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Windows service: Use JAVA_HOME environment variable in registry #16552 (issue: #13521)
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Scripting
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Class permission for Groovy references #16660 (issue: #16657)
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Settings
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Log warning if max file descriptors too low #16506
Bug fixesedit
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Aggregations
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Set meta data for pipeline aggregations #16516 (issue: #16484)
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Aliases
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Bulk
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Bulk api: fail deletes when routing is required but not specified #16675 (issues: #10136, #16645)
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Inner Hits
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Query and top level inner hit definitions shouldn’t overwrite each other #16222 (issue: #16218)
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Logging
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Add missing index name to indexing slow log #17026 (issue: #17025)
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Parent/Child
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Check that parent_type in Has Parent Query has child types #16923 (issue: #16692)
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Has child query forces default similarity #16611 (issues: #16550, #4977)
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Percolator
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Don’t replace found fields if map unmapped fields as string is enabled #16043 (issue: #10500)
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Plugin Cloud Azure
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Fix calling ensureOpen() on the wrong directory #16383
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Plugin Discovery GCE
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Add setFactory permission to GceDiscoveryPlugin #16860 (issue: #16485)
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Query DSL
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Use MappedFieldType.termQuery to generate simple_query_string queries #16686 (issue: #16577)
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REST
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Remove detect_noop from REST spec #16386
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Scripting
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Add permission to access sun.reflect.MethodAccessorImpl from Groovy scripts #16540 (issue: #16536)
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Snapshot/Restore
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Add node version check to shard allocation during restore #16520 (issue: #16519)
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Stats
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Fix recovery translog stats totals when recovering from store #16493 (issue: #15974)
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Tribe Node
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Passthrough environment and network settings to tribe client nodes #16893
Regressionsedit