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Elasticsearch version 6.1.1

Snapshot/Restore

Watcher

Ensured the watcher thread pool size is reasonably bound. In particular, the watcher thread pool size is now five times the number of processors until 50 threads are reached. If more than 50 cores exist and 50 threads exist, the watch thread pool size grows to match the number of processors.

Inner Hits

Add version support for inner hits in field collapsing (#27822) #27833 (issue: #27822)

Java REST Client

Do not use system properties when building the HttpAsyncClient #27829 (issue: #27827)

Monitoring

Data collectors now all share the same cluster state that existed at the beginning of data collection. This removes the extremely rare race condition where the cluster state can change between some data collectors, which could cause temporary issues in the Monitoring UI.

Search

Sequence IDs

Watcher

Fixed the pagerduty action to send context data. For more information, see PagerDuty action.

Ingest