Also see Breaking changes in 5.6.
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REST API
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Add ability to parse Content-Type from content type contains charset #27301 (issue: #27065)
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Core
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Fix content type detection with leading whitespace #32632 (issue: #32357)
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Index APIs
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Propagate mapping.single_type setting on shrinked index #31811 (issue: #31787)
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Ingest
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Ingest Attachment: Upgrade Tika to 1.18 #31252
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Network
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Ensure we don’t use a remote profile if cluster name matches #31331 (issue: #29321)
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Packaging
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Do not run
sysctl
for vm.max_map_count
when its already set #31285
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Search
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Fix race in clear scroll #31259