Also see Breaking changes in 2.3.
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Bulk
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Copy headers and context to individual requests inside a bulk #18816
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CAT API
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Fix merge stats rendering in RestIndicesAction #18720
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Expand wildcards to closed indices in /_cat/indices #18545 (issues: #16419, #17395)
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Cluster
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Fix block checks when no indices are specified #19047 (issue: #8105)
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Core
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Fix misplaced cast when parsing seconds #18548 (issue: #18546)
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Highlighting
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Skip all geo point queries in plain highlighter #18495 (issue: #17537)
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Internal
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Fix filtering of node ids for TransportNodesAction #18634 (issue: #18618)
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Percolator
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Fixed NPE when percolator filter option is "empty". #18563 (issue: #6172)
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REST
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Do not decode path when sending error #18477 (issue: #18476)
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Translog
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Translog can delete valid .ckp file when views are closed after the translog #19035 (issue: #16495)