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Elasticsearch version 6.4.2

Elasticsearch version 6.4.2

Enhancements

Search

Add a limit for graph phrase query expansion #34031

Bug fixes

Core

Fix AutoQueueAdjustingExecutorBuilder settings validation #33922

Index APIs

Allow to clear the fielddata cache per field #33807 (issue: #33798)

Network

Support PKCS#11 tokens as keystores and truststores [OPEN] #34063 (issue: #11)
Correctly handle PKCS#11 tokens for system keystore #33460 (issues: #11, #33459)

Security

Security: use default scroll keepalive #33639

Snapshot/Restore

Do not override named S3 client credentials #33793 (issue: #33769)

Watcher

Watcher: Ensure triggered watch deletion is sync #33799

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