Elasticsearch version 7.15.2
edit Also see Breaking changes in 7.15.
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Authorization
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Better logging and internal user handling for operator privileges #79331
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Aggregations
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Possible source of leaked delayable writables #80166
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Authorization
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Marking operator user no longer depends on license state #79595
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Preserve request headers in a mixed version cluster #79412 (issue: #79354)
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Try set operator user header on each node #79528
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Geo
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Fix circuit breaker leak in
MultiTerms aggregation #79362
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Guard geoline aggregation from parents aggegator that emit empty buckets #79129 (issue: #79128)
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Indices APIs
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Correctly merge lists with primitives #80336 (issue: #78211)
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Infra/Core
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Treat system indices with unexpected type as needing upgrade #78622 (issue: #78456)
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License
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Machine Learning
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Add
bucket_count_ks_test results reader for internode communication #79063
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Fix cancellation of named pipe connection on Linux if the remote end does not connect within the configured timeout period #2102
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Mapping
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Fix execution of exists query within nested queries on field with
doc_values disabled #78841 (issue: #76362)
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Network
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Ensure
indexing_data CCR requests are compressed #79413
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Snapshot/Restore
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Create cache files with CREATE_NEW & SPARSE options #79371
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Quicker shared cache file preallocation #79447
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TLS
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