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+[[release-notes-5.0.0-alpha2]]
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+== 5.0.0-alpha2 Release Notes
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+
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+Also see <<breaking-changes-5.0>>.
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+
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+[[breaking-5.0.0-alpha2]]
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+[float]
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+=== Breaking changes
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+
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+Analysis::
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+* Analyze API : Rename filters/token_filters/char_filter in Analyze API in master {pull}17843[#17843] (issue: {issue}15189[#15189])
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+
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+Cluster::
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+* Remove validation errors from cluster health response {pull}17773[#17773] (issue: {issue}16979[#16979])
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+
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+Indexed Scripts/Templates::
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+* Store indexed scripts in the cluster state instead of the `.scripts` index {pull}17650[#17650] (issue: {issue}16651[#16651])
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+
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+Packaging::
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+* Add JVM options configuration file {pull}17675[#17675] (issue: {issue}17121[#17121])
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+
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+Percolator::
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+* Remove `.percolator` type in favour of `percolator` field type {pull}17560[#17560]
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+
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+REST::
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+* Remove camelCase support {pull}17933[#17933] (issue: {issue}8988[#8988])
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+* Remove 'case' parameter from rest apis {pull}17774[#17774] (issue: {issue}8988[#8988])
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+* Disallow unquoted field names {pull}15351[#15351] (issue: {issue}9800[#9800])
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+
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+Settings::
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+* Remove `action.get.realtime` setting {pull}17857[#17857] (issue: {issue}12543[#12543])
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+* Remove Settings.settingsBuilder. {pull}17619[#17619]
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+
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+
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+
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+[[deprecation-5.0.0-alpha2]]
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+[float]
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+=== Deprecations
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+
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+Query DSL::
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+* Deprecate Indices query {pull}17710[#17710] (issue: {issue}12017[#12017])
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+* Deprecate mlt, in and geo_bbox query name shortcuts {pull}17507[#17507]
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+
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+Query Refactoring::
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+* Splits `phrase` and `phrase_prefix` in match query into `MatchPhraseQueryBuilder` and `MatchPhrasePrefixQueryBuilder` {pull}17508[#17508]
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+
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+
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+
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+[[feature-5.0.0-alpha2]]
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+[float]
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+=== New features
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+
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+Analysis::
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+* Add `fingerprint` token filter and `fingerprint` analyzer {pull}17873[#17873] (issue: {issue}13325[#13325])
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+
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+Plugin Analysis ICU::
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+* Adding support for customizing the rule file in ICU tokenizer {pull}13651[#13651] (issue: {issue}13146[#13146])
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+
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+
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+
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+[[enhancement-5.0.0-alpha2]]
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+[float]
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+=== Enhancements
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+
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+CAT API::
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+* Add _cat/tasks {pull}17551[#17551]
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+* Cat health supports ts=0 option {pull}13508[#13508] (issue: {issue}10109[#10109])
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+
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+Cache::
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+* Allow the query cache to be disabled. {pull}16268[#16268] (issue: {issue}15802[#15802])
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+
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+Cluster::
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+* Adds tombstones to cluster state for index deletions {pull}17265[#17265] (issues: {issue}16358[#16358], {issue}17435[#17435])
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+* Enable acked indexing {pull}17038[#17038] (issue: {issue}7572[#7572])
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+
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+Core::
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+* Kill thread local leak {pull}17921[#17921] (issues: {issue}283[#283], {issue}630[#630])
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+* Add heap size bootstrap check {pull}17728[#17728] (issue: {issue}17490[#17490])
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+* Remove hostname from NetworkAddress.format {pull}17601[#17601] (issue: {issue}17604[#17604])
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+* Bootstrapping bootstrap checks {pull}17595[#17595] (issues: {issue}17474[#17474], {issue}17570[#17570])
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+* Add max map count check {pull}16944[#16944]
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+
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+Geo::
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+* Enhanced lat/long error handling {pull}16833[#16833] (issue: {issue}16137[#16137])
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+
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+Index APIs::
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+* Fail hot_threads in a better way if unsupported by JDK {pull}15909[#15909]
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+
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+Ingest::
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+* Streamline option naming for several processors {pull}17892[#17892] (issue: {issue}17835[#17835])
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+
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+Internal::
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+* Makes Script type writeable {pull}17908[#17908] (issue: {issue}17753[#17753])
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+* FiltersAggregatorBuilder: Don't create new context for inner parsing {pull}17851[#17851]
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+* Clean up serialization on some stats {pull}17832[#17832] (issue: {issue}17085[#17085])
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+* Normalize registration for SignificanceHeuristics {pull}17830[#17830] (issue: {issue}17085[#17085])
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+* Make (read|write)NamedWriteable public {pull}17829[#17829] (issue: {issue}17682[#17682])
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+* Use try-with-resource when creating new parser instances where possible {pull}17822[#17822]
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+* Don't pass XContentParser to ParseFieldRegistry#lookup {pull}17794[#17794]
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+* Internal: Remove threadlocal from document parser {pull}17764[#17764]
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+* Cut range aggregations to registerAggregation {pull}17757[#17757] (issue: {issue}17085[#17085])
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+* Remove ParseFieldMatcher from AbstractXContentParser {pull}17756[#17756] (issue: {issue}17417[#17417])
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+* Remove parser argument from methods where we already pass in a parse context {pull}17738[#17738]
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+* Switch SearchAfterBuilder to writeGenericValue {pull}17735[#17735] (issue: {issue}17085[#17085])
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+* Remove StreamableReader {pull}17729[#17729] (issue: {issue}17085[#17085])
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+* Cleanup nested, has_child & has_parent query builders for inner hits construction {pull}17719[#17719] (issue: {issue}11118[#11118])
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+* Make AllocationCommands NamedWriteables {pull}17661[#17661]
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+* Isolate StreamableReader {pull}17656[#17656] (issue: {issue}17085[#17085])
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+* Create registration methods for aggregations similar to those for queries {pull}17653[#17653] (issues: {issue}17085[#17085], {issue}17389[#17389])
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+* Turn RestChannel into an interface {pull}17643[#17643] (issue: {issue}17133[#17133])
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+* Remove PROTOTYPEs from QueryBuilders {pull}17632[#17632] (issue: {issue}17085[#17085])
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+* Remove registerQueryParser {pull}17608[#17608]
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+* ParseField#getAllNamesIncludedDeprecated to not return duplicate names {pull}17504[#17504]
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+* Rework a query parser and improve registration {pull}17458[#17458]
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+* Clean up QueryParseContext and don't hold it inside QueryRewrite/ShardContext {pull}17417[#17417]
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+
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+Mapping::
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+* Automatically upgrade analyzed strings with an analyzer to `text`. {pull}17861[#17861]
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+* Support dots in field names when mapping already exists {pull}17759[#17759] (issue: {issue}15951[#15951])
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+* Use the new points API to index numeric fields. {pull}17746[#17746] (issues: {issue}11513[#11513], {issue}16751[#16751], {issue}17007[#17007], {issue}17700[#17700])
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+* Simplify AllEntries, AllField and AllFieldMapper: {pull}17613[#17613]
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+
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+Network::
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+* Limit request size {pull}17133[#17133] (issue: {issue}16011[#16011])
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+
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+Packaging::
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+* Remove unnecessary sleep from init script restart {pull}17966[#17966]
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+* Explicitly set packaging permissions {pull}17912[#17912] (issue: {issue}17634[#17634])
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+* Allow configuring Windows service name, description and user {pull}17312[#17312]
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+* rpm uses non-portable `--system` flag to `useradd` {pull}14596[#14596] (issue: {issue}14211[#14211])
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+
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+Percolator::
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+* PercolatorQueryBuilder cleanup by using MemoryIndex#fromDocument(...) helper {pull}17669[#17669] (issue: {issue}9386[#9386])
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+
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+Plugins::
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+* Cli: Improve output for usage errors {pull}17938[#17938]
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+* Cli: Add verbose output with zip url when installing plugin {pull}17662[#17662] (issue: {issue}17529[#17529])
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+
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+Query DSL::
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+* Add MatchNoDocsQuery, a query that matches no documents and prints the reason why in the toString method. {pull}17780[#17780]
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+* Adds `ignore_unmapped` option to geo queries {pull}17751[#17751]
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+* Adds `ignore_unmapped` option to nested and P/C queries {pull}17748[#17748]
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+* SimpleQueryParser should call MappedFieldType.termQuery when appropriate. {pull}17678[#17678]
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+
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+REST::
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+* Allow JSON with unquoted field names by enabling system property {pull}17801[#17801] (issue: {issue}17674[#17674])
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+
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+Recovery::
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+* TransportNodesListGatewayStartedShards should fall back to disk based index metadata if not found in cluster state {pull}17663[#17663] (issue: {issue}17630[#17630])
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+
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+Reindex API::
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+* Properly mark reindex's child tasks as child tasks {pull}17770[#17770]
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+
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+Search::
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+* Fail query if it contains very large rescores {pull}17917[#17917] (issue: {issue}17522[#17522])
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+
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+Settings::
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+* Switch to registered Settings for all IndexingMemoryController settings {pull}17778[#17778] (issue: {issue}17442[#17442])
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+
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+Stats::
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+* Add points to SegmentStats. {pull}17775[#17775] (issue: {issue}16974[#16974])
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+* Remove FieldStats.Float. {pull}17749[#17749]
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+* Show configured and remaining delay for an unassigned shard. {pull}17515[#17515] (issue: {issue}17372[#17372])
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+
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+Store::
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+* Use `mmapfs` by default. {pull}17616[#17616] (issue: {issue}16983[#16983])
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+
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+Suggesters::
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+* Add bwc support for reading pre-5.0 completion index {pull}17602[#17602]
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+
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+Task Manager::
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+* Move parentTaskId into TransportRequest {pull}17872[#17872]
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+* Shorten the serialization of the empty TaskId {pull}17870[#17870]
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+* Expose whether a task is cancellable in the _tasks list API {pull}17464[#17464] (issue: {issue}17369[#17369])
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+
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+
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+
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+[[bug-5.0.0-alpha2]]
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+[float]
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+=== Bug fixes
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+
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+Aggregations::
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+* Adds serialisation of sigma to extended_stats_bucket pipeline aggregation {pull}17703[#17703] (issue: {issue}17701[#17701])
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+* Fixes NPE when no window is specified in moving average request {pull}17556[#17556] (issue: {issue}17516[#17516])
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+* Fixes Filter and FiltersAggregation to work with empty query {pull}17542[#17542] (issue: {issue}17518[#17518])
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+* ExtendedStatsAggregator should also pass sigma to emtpy aggs. {pull}17388[#17388] (issue: {issue}17362[#17362])
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+
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+Allocation::
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+* Rebalancing policy shouldn't prevent hard allocation decisions {pull}17698[#17698] (issues: {issue}14057[#14057], {issue}14259[#14259])
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+* When considering the size of shadow replica shards, set size to 0 {pull}17509[#17509] (issue: {issue}17460[#17460])
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+
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+Core::
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+* Refactor UUID-generating methods out of Strings {pull}17837[#17837] (issue: {issue}17819[#17819])
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+* Node names cleanup {pull}17723[#17723] (issue: {issue}17718[#17718])
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+* NullPointerException from IndexingMemoryController when a version conflict happens during recovery {pull}17569[#17569]
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+
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+Ingest::
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+* Ingest does not close its factories {pull}17626[#17626] (issue: {issue}17625[#17625])
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+
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+Internal::
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+* Fix BulkItemResponse.Failure.toString {pull}17871[#17871]
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+
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+Logging::
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+* Add missing index name to search slow log. {pull}17818[#17818] (issue: {issue}17025[#17025])
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+
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+Mapping::
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+* Fix cross type mapping updates for `boolean` fields. {pull}17882[#17882] (issue: {issue}17879[#17879])
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+* Fix dynamic check to properly handle parents {pull}17864[#17864] (issues: {issue}17644[#17644], {issue}17854[#17854])
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+* Fix array parsing to remove its context when finished parsing {pull}17768[#17768]
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+* Disallow fielddata loading on text fields that are not indexed. {pull}17747[#17747]
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+* Fail if an object is added after a field with the same name. {pull}17568[#17568] (issue: {issue}17567[#17567])
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+
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+Packaging::
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+* Fix exit code {pull}17082[#17082]
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+
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+Plugin Discovery EC2::
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+* Fix EC2 Discovery settings {pull}17651[#17651] (issue: {issue}16602[#16602])
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+
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+Plugins::
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+* Quote path to java binary {pull}17496[#17496] (issue: {issue}17495[#17495])
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+
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+Query DSL::
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+* Apply the default operator on analyzed wildcard in simple_query_string builder {pull}17776[#17776]
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+* Apply the default operator on analyzed wildcard in query_string builder: {pull}17711[#17711] (issue: {issue}2183[#2183])
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+
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+REST::
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+* Fixes reading of CORS pre-flight headers and methods {pull}17523[#17523] (issue: {issue}17483[#17483])
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+* index is a required url part for update by query {pull}17503[#17503]
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+
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+Reindex API::
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+* Reindex should never report negative throttled_until {pull}17799[#17799] (issue: {issue}17783[#17783])
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+* Reindex should gracefully handle when _source is disabled {pull}17667[#17667] (issue: {issue}17666[#17666])
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+
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+Settings::
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+* convert settings for ResourceWatcherService to new infrastructure {pull}17948[#17948]
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+
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+Snapshot/Restore::
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+* Fix the semantics for the BlobContainer interface {pull}17878[#17878] (issues: {issue}15579[#15579], {issue}15580[#15580])
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+* On restore, selecting concrete indices can select wrong index {pull}17715[#17715]
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+
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+Task Manager::
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+* Shard level tasks in Bulk Action lose reference to their parent tasks {pull}17743[#17743]
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+
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+Term Vectors::
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+* Fix calculation of took time of term vectors request {pull}17817[#17817] (issue: {issue}12565[#12565])
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+
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+
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+
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+[[upgrade-5.0.0-alpha2]]
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+[float]
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+=== Upgrades
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+
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+Core::
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+* Upgrade to lucene 6 release {pull}17657[#17657]
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+
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Clinton Gormley