add release notes for 7.5.2 (#51259)

Adds release notes for 7.5.2
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Paul Sanwald 2020-01-21 12:48:11 -05:00 committed by Jason Tedor
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[[release-notes-7.5.2]]
== {es} version 7.5.2
coming::[7.5.2]
[[enhancement-7.5.2]]
[float]
=== Enhancements
Features/Ingest::
* Fork recursive calls in Foreach processor {pull}50514[#50514]
Infra/Core::
* Fix unintended debug logging in subclasses of TransportMasterNodeAction {pull}50839[#50839] (issues: {issue}50056[#50056], {issue}50074[#50074], {issue}50076[#50076])
[[bug-7.5.2]]
[float]
=== Bug fixes
Analysis::
* Fix caching for PreConfiguredTokenFilter {pull}50912[#50912] (issue: {issue}50734[#50734])
CRUD::
* Block too many concurrent mapping updates {pull}51038[#51038] (issue: {issue}50670[#50670])
Engine::
* Account soft-deletes in FrozenEngine {pull}51192[#51192] (issue: {issue}50775[#50775])
Features/ILM+SLM::
* Fix SLM check for restore in progress {pull}50868[#50868]
Features/Ingest::
* Fix ingest simulate response document order if processor executes async {pull}50244[#50244]
Features/Java Low Level REST Client::
* Improve warning value extraction performance in response {pull}50208[#50208] (issue: {issue}24114[#24114])
Machine Learning::
* Fixes potential memory corruption or inconsistent state when background
persisting categorizer state. {ml-pull}921[#921]
Mapping::
* Ensure that field collapsing works with field aliases. {pull}50722[#50722] (issues: {issue}32648[#32648], {issue}50121[#50121])
* Fix meta version of task index mapping {pull}50363[#50363] (issue: {issue}48393[#48393])
Recovery::
* Check allocation ID when failing shard on recovery {pull}50656[#50656] (issue: {issue}50508[#50508])
SQL::
* Change the way unsupported data types fields are handled {pull}50823[#50823]
* Optimization fixes for conjunction merges {pull}50703[#50703] (issue: {issue}49637[#49637])
* Fix issue with CAST and NULL checking. {pull}50371[#50371] (issue: {issue}50191[#50191])
* Fix NPE for JdbcResultSet.getDate(param, Calendar) calls {pull}50184[#50184] (issue: {issue}50174[#50174])
Search::
* Fix upgrade of custom similarity {pull}50851[#50851] (issue: {issue}50763[#50763])
Security::
* Always consume the request body of `has_privileges` API {pull}50298[#50298] (issue: {issue}50288[#50288])
[[release-notes-7.5.1]]
== {es} version 7.5.1