Also see Breaking changes in 5.1.
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Internal
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Don’t output null source node in RecoveryFailedException #21963
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Mapping
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Only update DocumentMapper if field type changes #22165
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Network
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Plugins
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Provide helpful error message if a plugin exists #22305 (issue: #22084)
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Add shutdown hook for closing CLI commands #22126 (issue: #22111)
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Aggregations
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Allow terms aggregations on pure boolean scripts. #22201 (issue: #20941)
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IP range masks exclude the maximum address of the range. #22018 (issue: #22005)
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Fix
other_bucket on the filters agg to be enabled if a key is set. #21994 (issue: #21951)
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Allocation
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Promote shadow replica to primary when initializing primary fails #22021
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Trim in-sync allocations set only when it grows #21976 (issue: #21719)
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Analysis
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Pre-built analysis factories do not implement MultiTermAware correctly. #21981
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CRUD
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Reject external versioning and explicit version numbers on create #21998
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Core
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Support negative numbers in readVLong #22314
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Exceptions
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Fixing shard recovery error message to report the number of docs correctly for each node #22515 (issue: #21893)
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Index APIs
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Ensure shrunk indices carry over version information from its source #22469 (issue: #22373)
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Java REST Client
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Don’t use null charset in RequestLogger #22197 (issue: #22190)
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Mapping
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The
_all default mapper is not completely configured. #22236
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Fix MapperService.allEnabled(). #22227
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Nested Docs
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Fix bug in query builder rewrite that ignores the ignore_unmapped option #22456
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Packaging
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Another fix for handling of paths on Windows #22132 (issue: #21921)
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Percolator
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Fix NPE in percolator’s now range check for percolator queries with range queries #22356 (issue: #22355)
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Plugin Lang Painless
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Update Painless Loop Counter to be Higher #22560 (issue: #22508)
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Plugin Repository Azure
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Recovery
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Fix primary relocation for shadow replicas #22474 (issue: #20300)
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Don’t close store under CancellableThreads #22434 (issue: #22325)
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Use a fresh recovery id when retrying recoveries #22325 (issue: #22043)
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Allow flush/force_merge/upgrade on shard marked as relocated #22078 (issue: #22043)
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Reindex API
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Don’t close rest client from its callback #22061 (issue: #22027)
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Search
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Improve concurrency of ShardCoreKeyMap. #22316
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Make
-0 compare less than +0 consistently. #22173 (issue: #22167)
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FiltersAggregationBuilder: rewriting filter queries, the same way as in FilterAggregationBuilder #22076
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Stats
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Implement stats for geo_point and geo_shape field #22391 (issue: #22384)
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Use reader for doc stats #22317 (issue: #22285)
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Avoid NPE in NodeService#stats if HTTP is disabled #22060 (issue: #22058)
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Add support for "include_segment_file_sizes" in indices stats REST handler #21879 (issue: #21878)
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Term Vectors
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Fix _termvectors with preference to not hit NPE #21959
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Return correct term statistics when a field is not found in a shard #21922 (issue: #21906)
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Logging
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Restores the original default format of search slow log #21770 (issue: #21711)