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Elasticsearch version 6.1.2

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Elasticsearch version 6.1.2

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Enhancements

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Internal

Make AbstractQueryBuilder.declareStandardFields to be protected (#27865) #27894 (issue: #27865)

Bug Fixes

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Aggregations

Fix incorrect results for aggregations nested under a nested aggregation #27946 (issue: #27912)
Fix composite aggregation when after term is missing in the shard #27936
Fix preserving FiltersAggregationBuilder#keyed field on rewrite #27900 (issue: #27841)

Engine

Use _refresh to shrink the version map on inactivity #27918 (issue: #27852)
Allow resize version map under lock even if there are pending operations #27870 (issue: #27852)

Network

Only bind loopback addresses when binding to local #28029

Recovery

Allow shrinking of indices from a previous major #28076 (issue: #28061)

Search

Use the underlying connection version for CCS connections #28093
Carry forward weights, etc on rescore rewrite #27981 (issue: #27979)

Snapshot/Restore

Fail restore when the shard allocations max retries count is reached #27493 (issue: #26865)

Translog

Only sync translog when global checkpoint increased #27973 (issues: #27837, #27970)

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