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Elasticsearch version 7.6.2

Also see Breaking changes in 7.6.

Breaking changes

Authorization

Creation of derived API keys (keys created by existing keys) now requires explicit "no privileges" configuration #53647, CVE-2020-7009

Bug fixes

Allocation

Improve performance of shards limits decider #53577 (issue: #53559)

Authentication

Fix potential bug in concurrent token refresh support #53668

CCR

Handle no such remote cluster exception in ccr #53415 (issue: #53225)

Distributed

Execute retention lease syncs under system context #53838 (issues: #48430, #53751)

Engine

Fix doc_stats and segment_stats of ReadOnlyEngine #53345 (issues: #51303, #51331)

Features/ILM+SLM

Fix null config in SnapshotLifecyclePolicy.toRequest #53328 (issues: #44465, #53171)
ILM Freeze step retry when not acknowledged #53287

Features/Ingest

Fix ingest pipeline _simulate api with empty docs never returns a res… #52937 (issue: #52833)

Features/Java High Level REST Client

Add unsupported parameters to HLRC search request #53745
Fix AbstractBulkByScrollRequest slices parameter via Rest #53068 (issue: #53044)

Features/Watcher

Disable Watcher script optimization for stored scripts #53497 (issue: #40212)

Infra/Core

Avoid self-suppression on grouped action listener #53262 (issue: #53174)

Infra/Packaging

Handle special characters and spaces in JAVA_HOME path in elasticsearch-service.bat #52676

Infra/Plugins

Ensure only plugin REST tests are run for plugins #53184 (issues: #52114, #53183)

Machine Learning

Fix a bug in the calculation of the minimum loss leaf values for classification #1032

Network

Invoke response handler on failure to send #53631

SQL

Fix NPE for parameterized LIKE/RLIKE #53573 (issue: #53557)
Add support for index aliases for SYS COLUMNS command #53525 (issue: #31609)
Fix issue with LIKE/RLIKE as painless script #53495 (issue: #53486)
Fix column size for IP data type #53056 (issue: #52762)

Search

Fix Term Vectors with artificial docs and keyword fields #53504 (issue: #53494)
Fix concurrent requests race over scroll context limit #53449
Fix pre-sorting of shards in the can_match phase #53397
Fix potential NPE in FuzzyTermsEnum #53231 (issue: #52894)

Upgrades

Infra/Core

Update jackson-databind to 2.8.11.6 #53522 (issue: #45225)

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.6.2.html