Also see Breaking changes in 6.1.
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Internal
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Make AbstractQueryBuilder.declareStandardFields to be protected (#27865) #27894 (issue: #27865)
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Aggregations
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Fix incorrect results for aggregations nested under a nested aggregation #27946 (issue: #27912)
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Fix composite aggregation when after term is missing in the shard #27936
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Fix preserving FiltersAggregationBuilder#keyed field on rewrite #27900 (issue: #27841)
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Engine
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Use
_refresh to shrink the version map on inactivity #27918 (issue: #27852)
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Allow resize version map under lock even if there are pending operations #27870 (issue: #27852)
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Network
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Only bind loopback addresses when binding to local #28029
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Recovery
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Allow shrinking of indices from a previous major #28076 (issue: #28061)
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Search
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Use the underlying connection version for CCS connections #28093
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Carry forward weights, etc on rescore rewrite #27981 (issue: #27979)
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Snapshot/Restore
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Fail restore when the shard allocations max retries count is reached #27493 (issue: #26865)
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Translog
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