See Multi data path bug in Elasticsearch 5.3.0.
Also see Breaking changes in 5.4.
Enhancementsedit
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Aggregations
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Allow scripted metric agg to access
_score #24295
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Core
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Improve bootstrap checks error messages #24548
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Internal
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Log JVM arguments on startup #24451
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Network
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Snapshot/Restore
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Ensure every repository has an incompatible-snapshots blob #24403 (issue: #22267)
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Stats
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Bug fixesedit
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Aggregations
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Fix ArrayIndexOutOfBoundsException when no ranges are specified in the query #23241 (issue: #22881)
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Allocation
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Discard stale node responses from async shard fetching #24434 (issue: #24007)
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Core
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Fix cache expire after access #24546
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Index APIs
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Fix legacy GeoPointField decoding in FieldStats #24534 (issue: #24275)
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Validates updated settings on closed indices #24487 (issue: #23787)
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Internal
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Remove
_UNRELEASED from Version constants for released versions #24764
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Avoid race when shutting down controller processes #24579
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Fix NPE if field caps request has a field that exists not in all indices #24504
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More Like This
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Pass over _routing value with more_like_this items to be retrieved #24679 (issue: #23699)
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Network
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Packaging
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Handle parentheses in batch file path #24731 (issue: #24712)
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Percolator
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Fix range queries with date range based on current time in percolator queries. #24666 (issue: #23921)
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Plugin Repository HDFS
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Fixing permission errors for
KERBEROS security mode for HDFS Repository #23439 (issue: #22156)
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Plugins
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X-Pack plugin download fails on Windows desktop [ISSUE] #24570
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Fix plugin installation permissions #24527 (issue: #24480)
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Reindex API
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Reindex: don’t duplicate _source parameter #24629 (issue: #24628)
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Add qa module that tests reindex-from-remote against pre-5.0 versions of Elasticsearch #24561 (issues: #23828, #24520)
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Scroll
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Fix single shard scroll within a cluster with nodes in version
>= 5.3 and <= 5.3 #24512
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Search
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Fix ExpandSearchPhase when response contains no hits #24688 (issue: #24672)
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Include all aliases including non-filtering in
_search_shards response #24489
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Settings
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Allow resetting settings that use an IP validator #24713 (issue: #24709)
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Snapshot/Restore
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Removes completed snapshot from cluster state on master change #24605 (issue: #24452)
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Fix inefficient (worst case exponential) loading of snapshot repository #24510 (issue: #24509)
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Core
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Upgrade to Lucene 6.5.1 #24399
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Network
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Upgrade to Netty 4.1.11.Final #24652
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Upgrade Netty to 4.1.10.Final #24414