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Elasticsearch version 6.6.2

Elasticsearch version 6.6.2

Also see Breaking changes in 6.6.

Breaking changes

Authentication

Disable BWC mode in TokenService by default #38881

Enhancements

SQL

Enhance checks for inexact fields #39427 (issue: #38501)
Add "validate.properties" property to JDBC’s allowed list of settings #39050 (issue: #38068)

Bug fixes

Authentication

Use consistent view of realms for authentication #38815 (issue: #30301)

Engine

Bubble up exception when processing NoOp #39338 (issue: #38898)
Advance max_seq_no before add operation to Lucene #38879 (issue: #31629)

Machine Learning

Stop the ML memory tracker before closing nodes #39111 (issue: #37117)
Fix an issue where interim results would be calculated after advancing time into an empty bucket #416 (issue: #324)

SQL

Fix merging of incompatible multi-fields #39560 (issue: #39547)
Ignore UNSUPPORTED fields for JDBC and ODBC modes in SYS COLUMNS #39518 (issue: #39471)
Use underlying exact field for LIKE/RLIKE #39443 (issue: #39442)
Enforce JDBC driver - ES server version parity #38972 (issue: #38775)
Fall back to using the field name for column label #38842 (issue: #38831)
Normalized keywords shouldn’t be allowed for groupings and sorting [ISSUE] #35203

Search

Fix Fuzziness#asDistance(String) #39643 (issue: #39614)
Fix simple query string serialization conditional #38960 (issues: #21504, #38889)

Watcher

Only flush Watcher’s bulk processor if Watcher is enabled #38803 (issue: #38798)

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