See Multi data path bug in Elasticsearch 5.3.0.
Also see Breaking changes in 5.3.
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Core
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Network
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Adjust default Netty receive predictor size to 64k #23542 (issue: #23185)
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REST
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Cluster stats should not render empty http/transport types #23735
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Aggregations
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The
filter and significant_terms aggregations should parse the filter as a filter, not a query. #23797
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Restore support for the
include/pattern syntax. #23140 (issue: #22933)
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Bulk
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Core
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Improve performance of extracting warning value #24114 (issue: #24018)
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Restrict build info loading to ES jar, not any jar #24049 (issue: #21955)
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Discovery
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ZenDiscovery - only validate min_master_nodes values if local node is master #23915 (issue: #23695)
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Index APIs
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Honor update request timeout #23825
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Inner Hits
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Replace
NestedChildrenQuery with ParentChildrenBlockJoinQuery #24039 (issue: #24016)
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Internal
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Add infrastructure to mark contexts as system contexts #23830
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Java REST Client
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Make buffer limit configurable in HeapBufferedConsumerFactory #23970 (issue: #23958)
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Mapping
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Preserve response headers when creating an index #23950 (issue: #23947)
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Fix NPE with scaled floats stats when field is not indexed #23528 (issue: #23487)
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Network
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Fix possible hang in local transport when nodes get concurrently disconnected #23962 (issue: #23942)
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Plugin Repository Azure
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Azure blob store’s readBlob() method first checks if the blob exists #23483 (issue: #23480)
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Reindex API
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Fix reindex with a remote source on a version before 2.0.0 #23805
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Search
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Disable graph analysis at query time for shingle and cjk filters producing tokens of different size #23920 (issue: #23918)
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Fix cross-cluster remote node gateway attributes #23863
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Use a fixed seed for computing term hashCode in TermsSliceQuery #23795
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Settings
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Stats
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Handle existence of cgroup version 2 hierarchy #23493 (issue: #23486)
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Internal
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upgrade to Lucene 6.4.2 #23933