Update docs for v8.15.2 release (elastic#113357)

Author: elasticsearchmachine

docs/reference/release-notes.asciidoc

@@ -6,6 +6,7 @@
 
 This section summarizes the changes in each release.
 
+* <<release-notes-8.15.2>>
 * <<release-notes-8.15.1>>
 * <<release-notes-8.15.0>>
 * <<release-notes-8.14.3>>
@@ -71,6 +72,7 @@ This section summarizes the changes in each release.
 
 --
 
+include::release-notes/8.15.2.asciidoc[]
 include::release-notes/8.15.1.asciidoc[]
 include::release-notes/8.15.0.asciidoc[]
 include::release-notes/8.14.3.asciidoc[]

docs/reference/release-notes/8.15.2.asciidoc

@@ -0,0 +1,44 @@
+[[release-notes-8.15.2]]
+== {es} version 8.15.2
+
+coming[8.15.2]
+
+Also see <<breaking-changes-8.15,Breaking changes in 8.15>>.
+
+[[bug-8.15.2]]
+[float]
+=== Bug fixes
+
+Authorization::
+* Fix remote cluster credential secure settings reload {es-pull}111535[#111535]
+
+ES|QL::
+* ESQL: Don't mutate the `BoolQueryBuilder` in plan {es-pull}111519[#111519]
+* ES|QL: Fix `ResolvedEnrichPolicy` serialization (bwc) in v 8.15 {es-pull}112985[#112985] (issue: {es-issue}112968[#112968])
+* Fix union-types where one index is missing the field {es-pull}111932[#111932] (issue: {es-issue}111912[#111912])
+* Support widening of numeric types in union-types {es-pull}112610[#112610] (issue: {es-issue}111277[#111277])
+
+Infra/Core::
+* JSON parse failures should be 4xx codes {es-pull}112703[#112703]
+* Json parsing exceptions should not cause 500 errors {es-pull}111548[#111548] (issue: {es-issue}111542[#111542])
+* Make sure file accesses in `DnRoleMapper` are done in stack frames with permissions {es-pull}112400[#112400]
+
+Ingest Node::
+* Fix missing header in `put_geoip_database` JSON spec {es-pull}112581[#112581]
+
+Logs::
+* Fix encoding of dynamic arrays in ignored source {es-pull}112713[#112713]
+
+Mapping::
+* Full coverage of ECS by ecs@mappings when `date_detection` is disabled {es-pull}112444[#112444] (issue: {es-issue}112398[#112398])
+
+Search::
+* Fix parsing error in `_terms_enum` API {es-pull}112872[#112872] (issue: {es-issue}94378[#94378])
+
+Security::
+* Allowlist `tracestate` header on remote server port {es-pull}112649[#112649]
+
+Vector Search::
+* Fix NPE in `dense_vector` stats {es-pull}112720[#112720]
+
+