Also see Breaking changes in 5.6.
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Network
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Add additional low-level logging handler #26887
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Unwrap exception causes when checking if dying #26884
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Aggregations
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Fix IndexOutOfBoundsException in histograms for NaN doubles (#26787) #26856 (issue: #26787)
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Core
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MetaData Builder doesn’t properly prevent an alias with the same name as an index #26804
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Packaging
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Fix default paths for Windows service #26875 (issue: #26873)
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Plugin Repository Azure
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Use Azure upload method instead of our own implementation (#26751) #26839 (issue: #26751)
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Search
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Fix serialization errors when cross-cluster search goes to a single shard #26881 (issue: #26833)