Added release notes for 5.0.0-alpha4

docs/reference/release-notes/5.0.0-alpha4.asciidoc

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+[[release-notes-5.0.0-alpha4]]
+== 5.0.0-alpha4 Release Notes
+
+Also see <<breaking-changes-5.0>>.
+
+IMPORTANT: This is an alpha release and is intended for _testing purposes only_. Indices created in this version will *not be compatible with Elasticsearch 5.0.0 GA*. Upgrading 5.0.0-alpha4 to any other version is not supported.
+
+[[breaking-5.0.0-alpha4]]
+[float]
+=== Breaking changes
+
+Aggregations::
+* Remove size 0 options in aggregations {pull}18854[#18854] (issue: {issue}18838[#18838])
+
+CRUD::
+* Wait for changes to be visible by search {pull}17986[#17986] (issue: {issue}1063[#1063])
+
+Core::
+* Register thread pool settings {pull}18674[#18674] (issues: {issue}18613[#18613], {issue}9216[#9216])
+* Remove cluster name from data path {pull}18554[#18554] (issue: {issue}17810[#17810])
+
+Highlighting::
+* Register Highlighter instances instead of classes {pull}18859[#18859]
+
+Inner Hits::
+* Also do not serialize `_index` key in search response for parent/child inner hits {pull}19011[#19011]
+* Don't include `_id`, `_type` and `_index` keys in search response for inner hits {pull}18995[#18995] (issue: {issue}18091[#18091])
+* Nested inner hits shouldn't use relative paths {pull}18567[#18567] (issue: {issue}16653[#16653])
+
+Internal::
+* Cleanup ClusterService dependencies and detached from Guice {pull}18941[#18941]
+* Simplify SubFetchPhase interface {pull}18881[#18881]
+* Simplify FetchSubPhase registration and detach it from Guice {pull}18862[#18862]
+
+Java API::
+* Remove setRefresh {pull}18752[#18752] (issue: {issue}1063[#1063])
+
+Mapping::
+* Remove `_timestamp` and `_ttl` on 5.x indices. {pull}18980[#18980] (issue: {issue}18280[#18280])
+
+Packaging::
+* Remove allow running as root {pull}18694[#18694] (issue: {issue}18688[#18688])
+
+Plugins::
+* Fail to start if plugin tries broken onModule {pull}19025[#19025]
+* Simplify ScriptModule and script registration {pull}18903[#18903]
+* Cut over settings registration to a pull model {pull}18890[#18890]
+* Plugins cleanup {pull}18594[#18594] (issue: {issue}18588[#18588])
+
+Scripting::
+* Move search template to lang-mustache module {pull}18765[#18765] (issue: {issue}17906[#17906])
+
+Search::
+* Remove only node preference {pull}18875[#18875] (issue: {issue}18822[#18822])
+* Add search preference to prefer multiple nodes {pull}18872[#18872] (issue: {issue}18822[#18822])
+
+Settings::
+* Rename boostrap.mlockall to bootstrap.memory_lock {pull}18669[#18669]
+
+Snapshot/Restore::
+* Change the default of `include_global_state` from true to false for snapshot restores {pull}18773[#18773] (issue: {issue}18569[#18569])
+
+
+
+[[feature-5.0.0-alpha4]]
+[float]
+=== New features
+
+Aggregations::
+* Adds aggregation profiling to the profile API {pull}18414[#18414] (issue: {issue}10538[#10538])
+* New Matrix Stats Aggregation module {pull}18300[#18300] (issue: {issue}16826[#16826])
+
+Index APIs::
+* Add rollover API to switch index aliases given some predicates {pull}18732[#18732] (issue: {issue}18647[#18647])
+
+Mapping::
+* Expose half-floats. {pull}18887[#18887]
+
+REST::
+* Low level Rest Client {pull}18735[#18735] (issue: {issue}7743[#7743])
+
+Scroll::
+* Add the ability to partition a scroll in multiple slices. {pull}18237[#18237] (issue: {issue}13494[#13494])
+
+Store::
+* Expose MMapDirectory.preLoad(). {pull}18880[#18880]
+* Add primitive to shrink an index into a single shard {pull}18270[#18270]
+
+
+
+[[enhancement-5.0.0-alpha4]]
+[float]
+=== Enhancements
+
+Aggregations::
+* Automatically set the collection mode to breadth_first in the terms aggregation when the cardinality of the field is unknown or smaller than the requested size. {pull}18779[#18779] (issue: {issue}9825[#9825])
+* Rename PipelineAggregatorBuilder to PipelineAggregationBuilder. {pull}18677[#18677] (issue: {issue}18377[#18377])
+* AggregatorBuilder and PipelineAggregatorBuilder do not need generics. {pull}18368[#18368] (issue: {issue}18133[#18133])
+
+Allocation::
+* Allow `_shrink` to N shards if source shards is a multiple of N {pull}18699[#18699]
+* Only filter intial recovery (post API) when shrinking an index {pull}18661[#18661]
+* Estimate shard size for shrinked indices {pull}18659[#18659]
+* Only fail relocation target shard if failing source shard is a primary {pull}18574[#18574] (issue: {issue}16144[#16144])
+* Simplify delayed shard allocation {pull}18351[#18351] (issue: {issue}18293[#18293])
+
+Analysis::
+* Add a MultiTermAwareComponent marker interface to analysis factories. {pull}19028[#19028] (issues: {issue}18064[#18064], {issue}9978[#9978])
+* Add Flags Parameter for Char Filter {pull}18363[#18363] (issue: {issue}18362[#18362])
+
+Cache::
+* Cache FieldStats in the request cache {pull}18768[#18768] (issue: {issue}18717[#18717])
+
+Cluster::
+* Index creation does not cause the cluster health to go RED {pull}18737[#18737] (issues: {issue}9106[#9106], {issue}9126[#9126])
+* Cluster Health class improvements {pull}18673[#18673]
+
+Core::
+* Read Elasticsearch manifest via URL {pull}18999[#18999] (issue: {issue}18996[#18996])
+* Throw if the local node is not set {pull}18963[#18963] (issue: {issue}18962[#18962])
+* Improve performance of applyDeletedShards {pull}18788[#18788] (issue: {issue}18776[#18776])
+* Bootstrap check for OnOutOfMemoryError and seccomp {pull}18756[#18756] (issue: {issue}18736[#18736])
+
+Dates::
+* Improve TimeZoneRoundingTests error messages {pull}18895[#18895]
+* Improve TimeUnitRounding for edge cases and DST transitions {pull}18589[#18589]
+
+Expressions::
+* improve date api for expressions/painless fields {pull}18658[#18658]
+
+Index APIs::
+* Add Shrink request source parser to parse create index request body {pull}18802[#18802]
+
+Index Templates::
+* Parse and validate mappings on index template creation {pull}8802[#8802] (issue: {issue}2415[#2415])
+
+Ingest::
+* Add `ignore_failure` option to all ingest processors {pull}18650[#18650] (issue: {issue}18493[#18493])
+* new ScriptProcessor for Ingest {pull}18193[#18193]
+
+Internal::
+* Hot methods redux {pull}19016[#19016] (issue: {issue}16725[#16725])
+* Remove forked joda time BaseDateTime class {pull}18953[#18953]
+* Support optional ctor args in ConstructingObjectParser {pull}18725[#18725]
+* Remove thread pool from page cache recycler {pull}18664[#18664] (issue: {issue}18613[#18613])
+
+Java API::
+* Switch QueryBuilders to new MatchPhraseQueryBuilder {pull}18753[#18753]
+
+Logging::
+* Throw IllegalStateException when handshake fails due to version or cluster mismatch {pull}18676[#18676]
+
+Mapping::
+* Upgrade `string` fields to `text`/`keyword` even if `include_in_all` is set. {pull}19004[#19004] (issue: {issue}18974[#18974])
+
+Network::
+* Exclude admin / diagnostic requests from HTTP request limiting {pull}18833[#18833] (issues: {issue}17951[#17951], {issue}18145[#18145])
+* Do not start scheduled pings until transport start {pull}18702[#18702]
+
+Packaging::
+* Remove explicit parallel new GC flag {pull}18767[#18767]
+* Use JAVA_HOME or java.exe in PATH like the Linux scripts do {pull}18685[#18685] (issue: {issue}4913[#4913])
+
+Percolator::
+* Add percolator query extraction support for dismax query {pull}18845[#18845]
+* Improve percolate query performance by not verifying certain candidate matches {pull}18696[#18696]
+* Improve percolator query term extraction {pull}18610[#18610]
+
+Plugin Lang Painless::
+* Painless Initializers {pull}19012[#19012]
+* Add augmentation {pull}19003[#19003]
+* Infer lambda arguments/return type {pull}18983[#18983]
+* Fix explicit casts and improve tests. {pull}18958[#18958]
+* Add lambda captures {pull}18954[#18954]
+* improve Debugger to print code even if it hits exception {pull}18932[#18932] (issue: {issue}1[#1])
+* Move semicolon hack into lexer {pull}18931[#18931]
+* Add flag support to regexes {pull}18927[#18927]
+* improve lambda syntax (allow single expression) {pull}18924[#18924]
+* Remove useless dropArguments in megamorphic cache {pull}18913[#18913]
+* non-capturing lambda support {pull}18911[#18911] (issue: {issue}18824[#18824])
+* fix bugs in operators and more improvements for the dynamic case {pull}18899[#18899]
+* improve unary operators and cleanup tests {pull}18867[#18867] (issue: {issue}18849[#18849])
+* Add support for the find operator (=~) and the match operator (==~) {pull}18858[#18858]
+* Remove casts and boxing for dynamic math {pull}18849[#18849] (issue: {issue}18847[#18847])
+* Refactor def math {pull}18847[#18847]
+* Add support for /regex/ {pull}18842[#18842]
+* Array constructor references {pull}18831[#18831]
+* Method references to user functions {pull}18828[#18828]
+* Add } as a delimiter.  {pull}18827[#18827] (issue: {issue}18821[#18821])
+* Add Lambda Stub Node {pull}18824[#18824]
+* Add capturing method references {pull}18818[#18818] (issue: {issue}18748[#18748])
+* Add Functions to Painless {pull}18810[#18810]
+* Add Method to Get New MethodWriters {pull}18771[#18771]
+* Static For Each {pull}18757[#18757]
+* Method reference support {pull}18748[#18748] (issue: {issue}18578[#18578])
+* Add support for the new Java 9 MethodHandles#arrayLength() factory {pull}18734[#18734]
+* Improve painless compile-time exceptions {pull}18711[#18711] (issue: {issue}18600[#18600])
+* add java.time packages to painless whitelist {pull}18621[#18621]
+* Add Function Reference Stub to Painless {pull}18578[#18578]
+
+Plugins::
+* Add did-you-mean for plugin cli {pull}18942[#18942] (issue: {issue}18896[#18896])
+* Plugins: Remove name() and description() from api {pull}18906[#18906]
+* Emit nicer error message when trying to install unknown plugin {pull}18876[#18876] (issue: {issue}17226[#17226])
+
+Query DSL::
+* Treat zero token in `common` terms query as MatchNoDocsQuery {pull}18656[#18656]
+* Handle empty query bodies at parse time and remove EmptyQueryBuilder {pull}17624[#17624] (issues: {issue}17540[#17540], {issue}17541[#17541])
+
+REST::
+* Adding status field in _msearch error request bodies {pull}18586[#18586] (issue: {issue}18013[#18013])
+
+Recovery::
+* index shard should be able to cancel check index on close. {pull}18839[#18839] (issue: {issue}12011[#12011])
+
+Reindex API::
+* Implement ctx.op = "delete" on _update_by_query and _reindex {pull}18614[#18614] (issue: {issue}18043[#18043])
+
+Scripting::
+*  Compile each Groovy script in its own classloader {pull}18918[#18918] (issue: {issue}18572[#18572])
+* Include script field even if it value is null {pull}18384[#18384] (issue: {issue}16408[#16408])
+
+Scroll::
+* Add an index setting to limit the maximum number of slices allowed in a scroll request. {pull}18782[#18782]
+
+Search::
+* Change default similarity to BM25 {pull}18948[#18948] (issue: {issue}18944[#18944])
+* Add a parameter to cap the number of searches the msearch api will concurrently execute {pull}18721[#18721]
+
+Sequence IDs::
+* Persist sequence number checkpoints {pull}18949[#18949] (issue: {issue}10708[#10708])
+* Add sequence numbers to cat shards API {pull}18772[#18772]
+
+Settings::
+* Improve error message if a setting is not found {pull}18920[#18920] (issue: {issue}18663[#18663])
+* Cleanup placeholder replacement {pull}17335[#17335]
+
+Snapshot/Restore::
+* Adds UUIDs to snapshots {pull}18228[#18228] (issue: {issue}18156[#18156])
+* Clarify the semantics of the BlobContainer interface {pull}18157[#18157] (issue: {issue}15580[#15580])
+
+Stats::
+* Add total_indexing_buffer/_in_bytes to nodes info API {pull}18914[#18914] (issue: {issue}18651[#18651])
+* Allow FieldStatsRequest to disable cache {pull}18900[#18900]
+* Remove index_writer_max_memory stat from segment stats {pull}18651[#18651] (issues: {issue}14121[#14121], {issue}7440[#7440])
+* Move DocStats under Engine to get more accurate numbers {pull}18587[#18587]
+
+Task Manager::
+* Fetch result when wait_for_completion {pull}18905[#18905]
+* Create get task API that falls back to the .tasks index {pull}18682[#18682]
+* Add ability to store results for long running tasks {pull}17928[#17928]
+
+Translog::
+* Beef up Translog testing with random channel exceptions {pull}18997[#18997]
+* Do not replay into translog on local recovery {pull}18547[#18547]
+
+
+
+[[bug-5.0.0-alpha4]]
+[float]
+=== Bug fixes
+
+Allocation::
+* Fix recovery throttling to properly handle relocating non-primary shards {pull}18701[#18701] (issue: {issue}18640[#18640])
+
+CAT API::
+* Fix merge stats rendering in RestIndicesAction {pull}18720[#18720]
+
+CRUD::
+* Squash a race condition in RefreshListeners {pull}18806[#18806]
+
+Circuit Breakers::
+* Never trip circuit breaker in liveness request {pull}18627[#18627] (issue: {issue}17951[#17951])
+
+Cluster::
+* Fix block checks when no indices are specified {pull}19047[#19047] (issue: {issue}8105[#8105])
+* Acknowledge index deletion requests based on standard cluster state acknowledgment {pull}18602[#18602] (issues: {issue}16442[#16442], {issue}18558[#18558])
+
+Core::
+* Throw exception if using a closed transport client {pull}18722[#18722] (issue: {issue}18708[#18708])
+
+Dates::
+* Fix invalid rounding value for TimeIntervalRounding close to DST transitions {pull}18800[#18800]
+* Fix problem with TimeIntervalRounding on DST end {pull}18780[#18780]
+
+Expressions::
+* replace ScriptException with a better one {pull}18600[#18600]
+
+Ingest::
+* Fix ignore_failure behavior in _simulate?verbose and more cleanup {pull}18987[#18987]
+
+Internal::
+* Fix filtering of node ids for TransportNodesAction {pull}18634[#18634] (issue: {issue}18618[#18618])
+
+Mapping::
+* Better error message when mapping configures null {pull}18809[#18809] (issue: {issue}18803[#18803])
+* Process dynamic templates in order. {pull}18638[#18638] (issues: {issue}18625[#18625], {issue}2401[#2401])
+
+Packaging::
+* Remove extra bin/ directory in bin folder {pull}18630[#18630]
+
+Plugin Lang Painless::
+* Fix compound assignment with string concats {pull}18933[#18933] (issue: {issue}18929[#18929])
+* Fix horrible capture {pull}18907[#18907] (issue: {issue}18899[#18899])
+* Fix Casting Bug {pull}18871[#18871]
+
+Query DSL::
+* Make parsing of bool queries stricter {pull}19052[#19052] (issue: {issue}19034[#19034])
+
+REST::
+* Get XContent params from request in Nodes rest actions {pull}18860[#18860] (issue: {issue}18794[#18794])
+
+Reindex API::
+* Fix a race condition in reindex's rethrottle {pull}18731[#18731] (issue: {issue}18744[#18744])
+
+Search::
+* Require timeout units when parsing query body {pull}19077[#19077] (issue: {issue}19075[#19075])
+* Close SearchContext if query rewrite failed {pull}18727[#18727]
+
+Settings::
+* Register "cloud.node.auto_attributes" setting in EC2 discovery plugin {pull}18678[#18678]
+
+Snapshot/Restore::
+* Better handling of an empty shard's segments_N file {pull}18784[#18784] (issue: {issue}18707[#18707])
+
+Stats::
+* Fix sync flush total shards statistics {pull}18766[#18766]
+
+Translog::
+* Fix translog replay multiple operations same doc {pull}18611[#18611] (issues: {issue}18547[#18547], {issue}18623[#18623])
+
+
+
+[[upgrade-5.0.0-alpha4]]
+[float]
+=== Upgrades
+
+Core::
+* Upgrade to Lucene 6.1.0. {pull}18926[#18926]
+* Upgrade to lucene-6.1.0-snapshot-3a57bea. {pull}18786[#18786]
+* Upgrade to Lucene 6.0.1. {pull}18648[#18648] (issues: {issue}17535[#17535], {issue}28[#28])
+
+Dates::
+* Upgrade joda-time to 2.9.4 {pull}18609[#18609] (issues: {issue}14524[#14524], {issue}18017[#18017])
+
+Packaging::
+* Upgrade JNA to 4.2.2 and remove optionality {pull}19045[#19045] (issue: {issue}13245[#13245])
+
+Plugin Discovery EC2::
+* Update aws sdk to 1.10.69 and add use_throttle_retries repository setting {pull}17784[#17784] (issues: {issue}538[#538], {issue}586[#586], {issue}589[#589])
+
+
+