Elasticsearch version 7.5.1edit
Also see Breaking changes in 7.5.
Enhancementsedit
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Features/Watcher
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Log attachment generation failures #50080
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Network
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Netty4: switch to composite cumulator #49478
Bug fixesedit
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Authentication
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Fix iterate-from-1 bug in smart realm order #49473
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CRUD
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Do not mutate request on scripted upsert #49578 (issue: #48670)
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Cluster Coordination
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Make elasticsearch-node tools custom metadata-aware #48390
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Engine
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Account trimAboveSeqNo in committed translog generation #50205 (issue: #49970)
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Features/ILM+SLM
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Handle failure to retrieve ILM policy step better #49193 (issue: #49128)
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Features/Java High Level REST Client
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Support es7 node http publish_address format #49279 (issue: #48950)
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Geo
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Fix handling of circles in legacy geo_shape queries #49410 (issue: #49296)
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Infra/Packaging
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Extend systemd timeout during startup #49784 (issue: #49593)
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Machine Learning
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Use query in cardinality check #49939
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Fix expired job results deletion audit message #49560 (issue: #49549)
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Apply source query on data frame analytics memory estimation #49527 (issue: #49454)
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Stop timing stats failure propagation #49495
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Mapping
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Improve DateFieldMapper
ignore_malformed handling #50090 (issue: #50081)
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Recovery
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Migrate peer recovery from translog to retention lease #49448 (issue: #45136)
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SQL
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COUNT DISTINCT returns 0 instead of NULL for no matching docs #50037 (issue: #50013)
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Fix LOCATE function optional parameter handling #49666 (issue: #49557)
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Fix NULL handling for FLOOR and CEIL functions #49644 (issue: #49556)
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Handle NULL arithmetic operations with INTERVALs #49633 (issue: #49297)
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Fix issue with GROUP BY YEAR() #49559 (issue: #49386)
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Fix issue with CASE/IIF pre-calculating results #49553 (issue: #49388)
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Fix issue with folding of CASE/IIF #49449 (issue: #49387)
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Fix issues with WEEK/ISO_WEEK/DATEDIFF #49405 (issues: #48209, #49376)
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Snapshot/Restore
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Transform
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Fix possible audit logging disappearance after rolling upgrade #49731 (issue: #49730)