All notable changes to this project are documented in this file.
The format is based on Keep a Changelog, and this project adheres to Semantic Versioning. See the CONTRIBUTING guide for instructions on how to add changelog entries.
- Support for HTTP/2 (server-side) (#3847)
- Allow mmap to use new JDK-19 preview APIs in Apache Lucene 9.4+ (#5151)
- Add events correlation engine plugin (#6854)
- Implement on behalf of token passing for extensions (#8679, #10664)
- Provide service accounts tokens to extensions (#9618)
- GHA to verify checklist items completion in PR descriptions (#10800)
- Allow to pass the list settings through environment variables (like [], ["a", "b", "c"], ...) (#10625)
- Views, simplify data access and manipulation by providing a virtual layer over one or more indices (#11957)
- Migrate client transports to Apache HttpClient / Core 5.x (#4459)
- Change http code on create index API with bad input raising NotXContentException from 500 to 400 (#4773)
- Improve summary error message for invalid setting updates (#4792)
- Return 409 Conflict HTTP status instead of 503 on failure to concurrently execute snapshots (#8986)
- Add task completion count in search backpressure stats API (#10028)
- Deprecate CamelCase
PathHierarchy
tokenizer name in favor to lowercasepath_hierarchy
(#10894) - Breaking change: Do not request "search_pipelines" metrics by default in NodesInfoRequest (#12497)
- Remove deprecated constant META_FIELDS_BEFORE_7DOT8 (#13860)
- Remove deprecated code to add node name into log pattern of log4j property file (#4568)
- Unused object and import within TransportClusterAllocationExplainAction (#4639)
- Remove LegacyESVersion.V_7_0_* and V_7_1_* Constants (#2768)
- Remove LegacyESVersion.V_7_2_ and V_7_3_ Constants (#4702)
- Always auto release the flood stage block (#4703)
- Remove LegacyESVersion.V_7_4_ and V_7_5_ Constants (#4704)
- Remove Legacy Version support from Snapshot/Restore Service (#4728)
- Remove deprecated serialization logic from pipeline aggs (#4847)
- Remove unused private methods (#4926)
- Remove LegacyESVersion.V_7_8_ and V_7_9_ Constants (#4855)
- Remove LegacyESVersion.V_7_6_ and V_7_7_ Constants (#4837)
- Remove LegacyESVersion.V_7_10_ Constants (#5018)
- Remove Version.V_1_ Constants (#5021)
- Remove custom Map, List and Set collection classes (#6871)