The xpack.security.authc.token.passphrase is deprecated. If this setting is not used, the cluster automatically generates a key, which is the recommended method. See Security settings.

Enhancements

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Core

Allow InputStreamStreamInput array size validation where applicable #26692
Refactor bootstrap check results and error messages #26637
Add BootstrapContext to expose settings and recovered state to bootstrap checks #26628
Unit testable index creation task on MetaDataCreateIndexService #25961

Discovery

Allow plugins to validate cluster-state on join #26595

Mapping

More efficient encoding of range fields. #26470 (issue: #26443)

Plugin Repository HDFS

Add permission checks before reading from HDFS stream #26716 (issue: #26714)

Recovery

Introduce a History UUID as a requirement for ops based recovery #26577 (issue: #10708)

Security

Added requirement for TLS/SSL when a cluster with security is running in production. If you try to upgrade to a production license when security is enabled, the upgrade is not successful until you configure TLS. For more information, see Setting Up TLS on a cluster.
Added bootstrap check that enforces the use of TLS when security is enabled and you are using a production license.

Scripting

ScriptService: Replace max compilation per minute setting with max compilation rate #26399

Search

Add soft limit on allowed number of script fields in request #26598 (issue: #26390)
Add a soft limit for the number of requested doc-value fields #26574 (issue: #26390)

Sequence IDs

Restoring from snapshot should force generation of a new history uuid #26694 (issues: #10708, #26544, #26557, #26577)
Add global checkpoint tracking on the primary #26666 (issue: #26591)
Introduce global checkpoint background sync #26591 (issues: #26573, #26630, #26666)
Move UNASSIGNED_SEQ_NO and NO_OPS_PERFORMED to SequenceNumbers` #26494 (issue: #10708)

Bug Fixes

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Aggregations

Do not delegate a null scorer to LeafBucketCollectors #26747 (issue: #26611)

Core

Fix cache compute if absent for expired entries #26516

Dates

Fix typo in date format #26503 (issue: #26500)

Highlighting

Fix percolator highlight sub fetch phase to not highlight query twice #26622

Inner Hits

Do not allow inner hits that fetch _source and have a non nested object field as parent #25749 (issue: #25315)

Internal

IndexShard.routingEntry should only be updated once all internal state is ready #26776
Catch exceptions and inform handler in RemoteClusterConnection#collectNodes #26725 (issue: #26700)
Internal: Add versionless alias for rest client codebase in policy files #26521

Java API

BulkProcessor flush runnable preserves the thread context from creation time #26718 (issue: #26596)

Java High Level REST Client

Make RestHighLevelClient’s Request class public #26627 (issue: #26455)
Forbid direct usage of ContentType.create() methods #26457 (issues: #22769, #26438)

Java REST Client

Better message text for ResponseException #26564

Machine Learning

Fixed problem with dropped or duplicated data when datafeeds used aggregations.
Fixed problems when model plot is enabled and there are sparse metrics.
Improved modeling of long-term trends.
Fixed a bug in calculation of mean values for seasonal components.
Added more accurate adherence to model memory limit.

Mapping

Allow copying from a field to another field that belongs to the same nested object. #26774 (issue: #26763)

Monitoring

Fixed the email message when cluster license expiration issues are resolved.

Plugin Analysis Kuromoji

Fix kuromoji default stoptags #26600 (issue: #26519)

Plugin Discovery File

Fix discovery-file plugin to use custom config path #26662 (issue: #26660)

Plugin Repository Azure

Azure snapshots can not be restored anymore #26778 (issues: #22858, #26751, #26777)
Snapshot : azure module - accelerate the listing of files (used in delete snapshot) #25710 (issue: #25424)

Plugin Repository HDFS

Add Log4j to SLF4J binding for repository-hdfs #26514 (issue: #26512)

Query DSL

Fixed incomplete JSON body on count request making org.elasticsearch.rest.action.RestActions#parseTopLevelQueryBuilder go into endless loop #26680 (issue: #26083)

Search

Fail query when a sort is provided in conjunction with rescorers #26510
Let search phases override max concurrent requests #26484 (issue: #26198)

Security

Added ability infer the keystore type from its pathname when the type is not specified.
Added usability improvements for the password bootstrap tool. For more information, see elasticsearch-setup-passwords.

Similarities

Add boolean similarity to built in similarity types #26613

Upgrade API

Upgrade API: fix excessive logging and unnecessary template updates #26698 (issue: #26673)

Watcher

Fixed Watcher such that it loads only active watches.

Upgrades

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Core

Upgrade to Lucene 7.0.0 #26744
Upgrade to lucene-7.0.0-snapshot-d94a5f0. #26441

Logging

Upgrade to Log4j 2.9.1 #26750 (issues: #109, #26464, #26467)
Upgrade to Log4j 2.9.0 #26450 (issue: #23798)

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