Also see Breaking changes in 2.2.
Enhancementsedit
Bug fixesedit
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Allocation
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IndicesStore checks for
allocated elsewhere
for every shard not alocated on the local node #17106
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CAT API
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Fix column aliases in _cat/indices, _cat/nodes and _cat/shards APIs #17145 (issue: #17101)
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Geo
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Remove .geohash suffix from GeoDistanceQuery and GeoDistanceRangeQuery #15871 (issue: #15179)
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Recovery
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Try to renew sync ID if
flush=true
on forceMerge #17108 (issue: #17019)
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Translog
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Call ensureOpen on Translog#newView() to prevent IllegalStateException #17191