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+## Version 3.7.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 3.7.0
+
+### Features
+
+* Add dynamic properties support for pattern-based field definitions without cluster state mapping updates ([#20816](https://github.com/opensearch-project/OpenSearch/pull/20816))
+* Add pluggable data format engine with DataFormatAwareEngine for multi-format indexing ([#21181](https://github.com/opensearch-project/OpenSearch/pull/21181))
+* Add Lucene engine implementation for pluggable data formats ([#21299](https://github.com/opensearch-project/OpenSearch/pull/21299))
+* Add merge support for Parquet data format plugin via streaming k-way merge sort ([#21079](https://github.com/opensearch-project/OpenSearch/pull/21079))
+* Add directory and IndexInput layers for WritableWarm tiered storage ([#21178](https://github.com/opensearch-project/OpenSearch/pull/21178))
+* Add server-side implementation for tiering status APIs (GetTieringStatus and ListTieringStatus) ([#21220](https://github.com/opensearch-project/OpenSearch/pull/21220))
+* Add server-side implementation for HotToWarm, WarmToHot, and CancelTiering APIs ([#21295](https://github.com/opensearch-project/OpenSearch/pull/21295))
+* Add prefetch settings and stored fields prefetch for WritableWarm tiered storage ([#21285](https://github.com/opensearch-project/OpenSearch/pull/21285))
+* Add slow logs, per-query metrics, and migration metrics for WritableWarm tiered storage ([#21332](https://github.com/opensearch-project/OpenSearch/pull/21332))
+* Add module wiring and integration tests for WritableWarm tiered storage ([#21427](https://github.com/opensearch-project/OpenSearch/pull/21427))
+* Add tiered object storage crate for warm node file routing ([#21204](https://github.com/opensearch-project/OpenSearch/pull/21204))
+* Add event-driven scheduler and stage execution for analytics engine ([#21242](https://github.com/opensearch-project/OpenSearch/pull/21242))
+* Add coordinator-side DataFusion reduce with streaming Arrow batches ([#21356](https://github.com/opensearch-project/OpenSearch/pull/21356))
+* Add distributed aggregation with partial/final mode for analytics engine ([#21457](https://github.com/opensearch-project/OpenSearch/pull/21457))
+* Add distributed join planning and execution for analytics engine ([#21639](https://github.com/opensearch-project/OpenSearch/pull/21639))
+* Add PPL `append` command support with multi-child stage runtime for Union ([#21474](https://github.com/opensearch-project/OpenSearch/pull/21474))
+* Add PPL `dedup` command support via ROW_NUMBER window function ([#21622](https://github.com/opensearch-project/OpenSearch/pull/21622))
+* Add PPL `eventstats` and `streamstats` window function support ([#21734](https://github.com/opensearch-project/OpenSearch/pull/21734))
+* Add PPL `top` and `rare` command support via window functions ([#21593](https://github.com/opensearch-project/OpenSearch/pull/21593))
+* Add PPL `parse` command with regex mode via Rust UDFs ([#21573](https://github.com/opensearch-project/OpenSearch/pull/21573))
+* Add PPL `rex` command with sed and extract modes ([#21550](https://github.com/opensearch-project/OpenSearch/pull/21550))
+* Add PPL `spath` command with auto-extract mode via json_extract_all UDF ([#21664](https://github.com/opensearch-project/OpenSearch/pull/21664))
+* Add 7 PPL JSON scalar functions to analytics engine route ([#21513](https://github.com/opensearch-project/OpenSearch/pull/21513))
+* Add 23 PPL datetime scalar functions to analytics engine route ([#21556](https://github.com/opensearch-project/OpenSearch/pull/21556))
+* Add 14 additional PPL datetime functions (Wave A) including strftime, date_format, maketime ([#21582](https://github.com/opensearch-project/OpenSearch/pull/21582))
+* Add 30+ PPL math scalar functions to analytics engine ([#21520](https://github.com/opensearch-project/OpenSearch/pull/21520))
+* Add PPL string scalar functions to analytics engine (18 functions) ([#21543](https://github.com/opensearch-project/OpenSearch/pull/21543))
+* Add PPL conditional functions (coalesce, isempty, isblank, case, if, ifnull) to analytics engine ([#21643](https://github.com/opensearch-project/OpenSearch/pull/21643))
+* Add PPL conversion scalar functions (num, auto, memk, rmcomma, dur2sec, ctime, mktime) to analytics engine ([#21628](https://github.com/opensearch-project/OpenSearch/pull/21628))
+* Add PPL cryptographic functions (md5, sha1, sha2, crc32) to analytics engine ([#21611](https://github.com/opensearch-project/OpenSearch/pull/21611))
+* Add PPL array constructor and 8 multivalue functions to analytics engine ([#21554](https://github.com/opensearch-project/OpenSearch/pull/21554))
+* Add PPL bucketing scalars (span_bucket, width_bucket, minspan_bucket, range_bucket) ([#21621](https://github.com/opensearch-project/OpenSearch/pull/21621))
+* Add PPL TAKE, FIRST, LAST, LIST, VALUES aggregate functions ([#21731](https://github.com/opensearch-project/OpenSearch/pull/21731))
+* Add Lucene filter delegation from DataFusion for full-text search predicates ([#21555](https://github.com/opensearch-project/OpenSearch/pull/21555))
+* Add performance delegation to Lucene for selective filter predicates ([#21701](https://github.com/opensearch-project/OpenSearch/pull/21701))
+* Add native Arrow transport path with zero-copy transfer for stream transport ([#21253](https://github.com/opensearch-project/OpenSearch/pull/21253))
+* Stream Arrow batches on data-node fragment execution path ([#21418](https://github.com/opensearch-project/OpenSearch/pull/21418))
+* Add support for `extra_fields` outside `_source` indexing for improved vector ingestion throughput ([#20635](https://github.com/opensearch-project/OpenSearch/pull/20635))
+* Add gRPC support for Min, Max, and Terms aggregations ([#21205](https://github.com/opensearch-project/OpenSearch/pull/21205))
+* Add partition strategy setting for flexible shard-to-partition mapping in pull-based ingestion ([#21165](https://github.com/opensearch-project/OpenSearch/pull/21165))
+* Add SplitToFieldsProcessor for distributing split values to target fields ([#21216](https://github.com/opensearch-project/OpenSearch/pull/21216))
+* Add native memory based admission control for transport request throttling ([#21191](https://github.com/opensearch-project/OpenSearch/pull/21191))
+* Add native memory search backpressure for off-heap query cancellation ([#21647](https://github.com/opensearch-project/OpenSearch/pull/21647))
+* Add unified native allocator framework for Arrow allocations with elastic rebalancing ([#21703](https://github.com/opensearch-project/OpenSearch/pull/21703))
+* Add on-demand jemalloc heap profiling support via JMX CLI tool ([#21599](https://github.com/opensearch-project/OpenSearch/pull/21599))
+* Add `search.max_buckets` to workload group settings for per-tenant bucket limits ([#21721](https://github.com/opensearch-project/OpenSearch/pull/21721))
+* Add additional search settings and `override_request_values` to workload management groups ([#21523](https://github.com/opensearch-project/OpenSearch/pull/21523))
+* Add hunspell dictionary hot-reload support via `_refresh_search_analyzers` API ([#21559](https://github.com/opensearch-project/OpenSearch/pull/21559))
+
+### Enhancements
+
+* Add adaptive query budget for DataFusion engine with bounded memory and improved throughput ([#21695](https://github.com/opensearch-project/OpenSearch/pull/21695))
+* Add DynamicLimitPool for runtime memory pool limit changes in DataFusion ([#21286](https://github.com/opensearch-project/OpenSearch/pull/21286))
+* Add configurable coordinator buffer limit for per-query Arrow allocator ([#21726](https://github.com/opensearch-project/OpenSearch/pull/21726))
+* Add CPU task cancellation for DataFusion queries ([#21560](https://github.com/opensearch-project/OpenSearch/pull/21560))
+* Add IO task cancellation support for DataFusion queries ([#21531](https://github.com/opensearch-project/OpenSearch/pull/21531))
+* Add DataFusion logical and physical plan logging at DEBUG level ([#21646](https://github.com/opensearch-project/OpenSearch/pull/21646))
+* Add dynamic settings for indexed query execution path ([#21522](https://github.com/opensearch-project/OpenSearch/pull/21522))
+* Add dedicated `analytics_scheduler` thread pool to prevent coordinator deadlock ([#21771](https://github.com/opensearch-project/OpenSearch/pull/21771))
+* Add dedicated `analytics_reduce` thread pool for coordinator reduce drains ([#21800](https://github.com/opensearch-project/OpenSearch/pull/21800))
+* Add native memory stats and task cancellation stats to node stats API ([#21637](https://github.com/opensearch-project/OpenSearch/pull/21637))
+* Add `current_application_duration_ms` to cluster state download stats in node stats API ([#20922](https://github.com/opensearch-project/OpenSearch/pull/20922))
+* Add segments and segment stats support for DataFormatAwareEngine ([#21696](https://github.com/opensearch-project/OpenSearch/pull/21696))
+* Add DataFormat-aware NRT replication engine and remote-store wiring ([#21311](https://github.com/opensearch-project/OpenSearch/pull/21311))
+* Add DataFormat-aware shallow snapshot v2 support ([#21742](https://github.com/opensearch-project/OpenSearch/pull/21742))
+* Add DataFormat-aware read-only engine for warm primaries with tiering service improvements ([#21720](https://github.com/opensearch-project/OpenSearch/pull/21720))
+* Add dynamic mapping support for pluggable data formats ([#21444](https://github.com/opensearch-project/OpenSearch/pull/21444))
+* Add delete execution engine abstraction for DataFormatAwareEngine ([#21313](https://github.com/opensearch-project/OpenSearch/pull/21313))
+* Add cluster-scope defaults for pluggable dataformat settings ([#21435](https://github.com/opensearch-project/OpenSearch/pull/21435))
+* Add indexing support for metadata fields in pluggable data formats ([#21585](https://github.com/opensearch-project/OpenSearch/pull/21585))
+* Add Lucene merge support for pluggable data format composite engine ([#21422](https://github.com/opensearch-project/OpenSearch/pull/21422))
+* Add composite merge handler and merge policy for data-format-aware engine ([#21128](https://github.com/opensearch-project/OpenSearch/pull/21128))
+* Add sort-on-refresh for composite engine with cross-format row-ID consistency ([#21468](https://github.com/opensearch-project/OpenSearch/pull/21468))
+* Add warm+format directory wiring with per-format tiered directory routing ([#21361](https://github.com/opensearch-project/OpenSearch/pull/21361))
+* Add block cache SPI and Foyer plugin for warm nodes ([#21530](https://github.com/opensearch-project/OpenSearch/pull/21530))
+* Add REST API paths for block cache prune and detailed file cache stats ([#21705](https://github.com/opensearch-project/OpenSearch/pull/21705))
+* Add cancellation checkpoints in field data loading and aggregation paths ([#21318](https://github.com/opensearch-project/OpenSearch/pull/21318))
+* Add `queryTimeout` to IndexSearcher for KNN vector search timeout enforcement ([#21316](https://github.com/opensearch-project/OpenSearch/pull/21316))
+* Add index-level authorization to analytics engine via ActionFilter dispatch ([#21789](https://github.com/opensearch-project/OpenSearch/pull/21789))
+* Add `/_analytics/ppl/_explain` endpoint with stage profiling ([#21660](https://github.com/opensearch-project/OpenSearch/pull/21660))
+* Add relevance function support (match_phrase, multi_match, query_string, etc.) to analytics engine ([#21562](https://github.com/opensearch-project/OpenSearch/pull/21562))
+* Add relevance functions optional parameter support and new functions (wildcard_query, query, match_all) ([#21661](https://github.com/opensearch-project/OpenSearch/pull/21661))
+* Add filter pushdown rules and Calcite rule metrics for profiling ([#21684](https://github.com/opensearch-project/OpenSearch/pull/21684))
+* Add per-column encoding and compression configuration for Parquet data format ([#21665](https://github.com/opensearch-project/OpenSearch/pull/21665))
+* Avoid repeated encoding and compression for sort column writes in Parquet ([#21464](https://github.com/opensearch-project/OpenSearch/pull/21464))
+* Add pipeline execution metrics to PollingIngestStats for pull-based ingestion ([#21024](https://github.com/opensearch-project/OpenSearch/pull/21024))
+* Add batching for persistent task cluster service to reduce cluster manager load ([#21245](https://github.com/opensearch-project/OpenSearch/pull/21245))
+* Refactor BitsetFilterCache to node-level cache with configurable size limit ([#21179](https://github.com/opensearch-project/OpenSearch/pull/21179))
+* Skip zone awareness when `auto_expand_replicas` is set to all ([#21217](https://github.com/opensearch-project/OpenSearch/pull/21217))
+* Relax field-level meta validation constraints to allow any number of entries with string values ([#20578](https://github.com/opensearch-project/OpenSearch/pull/20578))
+* Deprecate boolean constructor of FetchSourceContext in favor of static constants ([#21235](https://github.com/opensearch-project/OpenSearch/pull/21235))
+* Add validation and deprecation warnings for ambiguous `_source` filtering ([#21203](https://github.com/opensearch-project/OpenSearch/pull/21203))
+* Speed up Painless Script Engine initialization by ~10% ([#21463](https://github.com/opensearch-project/OpenSearch/pull/21463))
+* Fix accumulation of file sizes when multiple files share the same extension in segment stats ([#21000](https://github.com/opensearch-project/OpenSearch/pull/21000))
+* Improve native memory admission control precision with auto-derived budget and JVM non-heap subtraction ([#21749](https://github.com/opensearch-project/OpenSearch/pull/21749))
+* Tighten DataFusion memory guard with RSS-based hard guard to prevent OOM under concurrent load ([#21814](https://github.com/opensearch-project/OpenSearch/pull/21814))
+* Support `indices_boost_2` array format for gRPC search ([#21300](https://github.com/opensearch-project/OpenSearch/pull/21300))
+* Add configurable Kafka metadata timeout for pull-based ingestion ([#21425](https://github.com/opensearch-project/OpenSearch/pull/21425))
+* Expose tokio-metrics as DataFusion plugin stats ([#21303](https://github.com/opensearch-project/OpenSearch/pull/21303))
+* Add Lucene FFM callbacks to task resource tracking ([#21610](https://github.com/opensearch-project/OpenSearch/pull/21610))
+
+### Bug Fixes
+
+* Fix YAML parser corrupting string values that resemble booleans after Jackson 3.x migration ([#21294](https://github.com/opensearch-project/OpenSearch/pull/21294))
+* Fix `map_unmapped_fields_as_text` lost after dynamic mapping update in PercolatorFieldMapper ([#21301](https://github.com/opensearch-project/OpenSearch/pull/21301))
+* Fix O(n²) removeAll in remote translog metadata cleanup causing CPU spikes ([#21350](https://github.com/opensearch-project/OpenSearch/pull/21350))
+* Fix `Rounding.isUTC()` to recognize UTC timezone aliases for date histogram optimization ([#21221](https://github.com/opensearch-project/OpenSearch/pull/21221))
+* Fix NPE in QueryPhaseResultConsumer when all shards fail ([#21158](https://github.com/opensearch-project/OpenSearch/pull/21158))
+* Fix bulk request hang when index is deleted during primary phase ([#21305](https://github.com/opensearch-project/OpenSearch/pull/21305))
+* Fix deadlock between engineMutex and writeLock during index close and engine reset ([#21404](https://github.com/opensearch-project/OpenSearch/pull/21404))
+* Fix FlightOutboundHandler clearing caller's ThreadContext ([#21167](https://github.com/opensearch-project/OpenSearch/pull/21167))
+* Fix `IndicesRequestCacheCleanupIT` flakiness by removing too-short assertBusy timeouts ([#21494](https://github.com/opensearch-project/OpenSearch/pull/21494))
+* Fix negative fielddata stats by guarding against stale removals after shard reallocation ([#21667](https://github.com/opensearch-project/OpenSearch/pull/21667))
+* Fix `half_float` ingest writing wrong fp16 bit pattern in Parquet ([#21783](https://github.com/opensearch-project/OpenSearch/pull/21783))
+* Fix StringView buffer bloat in DataFusion stream_next FFI export causing 435x data amplification ([#21753](https://github.com/opensearch-project/OpenSearch/pull/21753))
+* Fix Utf8View/Utf8 schema mismatch panic in indexed parquet path ([#21826](https://github.com/opensearch-project/OpenSearch/pull/21826))
+* Fix memory leak in `transport-reactor-netty4` plugin with persistent connections ([#21788](https://github.com/opensearch-project/OpenSearch/pull/21788))
+* Fix `ExitablePostingsEnum` to extend `FilterPostingsEnum` for proper delegation ([#21558](https://github.com/opensearch-project/OpenSearch/pull/21558))
+* Fix local recovery from flush for DataFormatAwareEngine ([#21553](https://github.com/opensearch-project/OpenSearch/pull/21553))
+* Fix safe-commit info and replication checksum for DFA shards ([#21787](https://github.com/opensearch-project/OpenSearch/pull/21787))
+* Fix DFA recovery failures: file-handle leak and reset-path crash ([#21759](https://github.com/opensearch-project/OpenSearch/pull/21759))
+* Handle null scripted metric combine results ([#21534](https://github.com/opensearch-project/OpenSearch/pull/21534))
+* Demote "No resource usage stats available for node" log from WARN to DEBUG ([#21638](https://github.com/opensearch-project/OpenSearch/pull/21638))
+* Fix pull-based ingestion document mapper usage to reflect mapping updates ([#21183](https://github.com/opensearch-project/OpenSearch/pull/21183))
+* Fix pull-based ingestion consumer factory to be stateless and prevent race conditions ([#21652](https://github.com/opensearch-project/OpenSearch/pull/21652))
+* Fix pull-based ingestion multi-threaded writer batchStartPointer computation ([#21697](https://github.com/opensearch-project/OpenSearch/pull/21697))
+* Fix Netty4Http3ServerTransport to use configured HeaderVerifier and Decompressor instances ([#21281](https://github.com/opensearch-project/OpenSearch/pull/21281))
+* Convert varchar to str in analytics engine Project operations to fix DataFusion type errors ([#21794](https://github.com/opensearch-project/OpenSearch/pull/21794))
+* Fix `microsecond()` function and add timestamp lower-bound validation in analytics engine ([#21793](https://github.com/opensearch-project/OpenSearch/pull/21793))
+* Enforce write blocks for DFA hot-to-warm tiering to survive DiskThresholdMonitor removal ([#21828](https://github.com/opensearch-project/OpenSearch/pull/21828))
+
+### Maintenance
+
+* Bump Netty to 4.2.14.Final ([#21772](https://github.com/opensearch-project/OpenSearch/pull/21772))
+* Update Jackson to 2.21.3 / 3.1.3 ([#21493](https://github.com/opensearch-project/OpenSearch/pull/21493))
+* Update ASM to 9.10 ([#21764](https://github.com/opensearch-project/OpenSearch/pull/21764))
+* Update OpenTelemetry to 1.62.0 and SemConv to 1.41.0 ([#21595](https://github.com/opensearch-project/OpenSearch/pull/21595))
+* Update Project Reactor to 3.8.5 and Reactor Netty to 1.3.5 ([#21226](https://github.com/opensearch-project/OpenSearch/pull/21226))
+* Update bundled JDK to JDK 25.0.3 ([#21353](https://github.com/opensearch-project/OpenSearch/pull/21353))
+* Update log4j2 to 2.25.4 ([#21416](https://github.com/opensearch-project/OpenSearch/pull/21416))
+* Update `httpclient5` to 5.6.1 ([#21441](https://github.com/opensearch-project/OpenSearch/pull/21441))
+* Bump commons-configuration2 from 2.14.0 to 2.15.0 ([#21806](https://github.com/opensearch-project/OpenSearch/pull/21806))
+* Bump org.apache.commons:commons-configuration2 from 2.13.0 to 2.14.0 ([#21213](https://github.com/opensearch-project/OpenSearch/pull/21213))
+* Bump com.google.protobuf from 0.9.6 to 0.10.0 ([#21291](https://github.com/opensearch-project/OpenSearch/pull/21291))
+* Bump org.apache.hadoop:hadoop-minicluster from 3.4.2 to 3.5.0 ([#21138](https://github.com/opensearch-project/OpenSearch/pull/21138))
+* Bump org.codehaus.woodstox:stax2-api from 4.2.2 to 4.3.0 ([#21137](https://github.com/opensearch-project/OpenSearch/pull/21137))
+* Bump org.jline:jline from 4.0.0 to 4.0.14 ([#21471](https://github.com/opensearch-project/OpenSearch/pull/21471))
+* Bump org.jsoup:jsoup from 1.22.1 to 1.22.2 ([#21290](https://github.com/opensearch-project/OpenSearch/pull/21290))
+* Bump com.nimbusds:nimbus-jose-jwt from 10.8 to 10.9 ([#21214](https://github.com/opensearch-project/OpenSearch/pull/21214))
+* Remove Unsafe class injection from Java agent ([#21542](https://github.com/opensearch-project/OpenSearch/pull/21542))
+* Replace mimalloc with jemalloc as global allocator for native sandbox plugins ([#21497](https://github.com/opensearch-project/OpenSearch/pull/21497))
+* Upgrade DataFusion to v53 and Arrow to v58 ([#21590](https://github.com/opensearch-project/OpenSearch/pull/21590))
+* Pin GitHub Actions to commit SHAs for supply chain security ([#21808](https://github.com/opensearch-project/OpenSearch/pull/21808))
+* Update FIPS bootstrap check to use OpenSearch env var instead of BouncyCastle system property ([#21415](https://github.com/opensearch-project/OpenSearch/pull/21415))