Elasticsearch 9.4.8 → 9.5.6

8 releases · 0 breaking changes · 22 security fixes · 0 advisories fixed

22security0breaking0deprecated126feature173fix

Is 9.4.8 affected?

Breaking changes

None in the release notes.

Security changes

security Fixes CVE-2026-103009: Authorization Bypass Through User-Controlled Key (CWE-639) in Elasticsearch can lead to Information Disclosure via a specially crafted cross-cluster search request that references an unauthorized s… in 9.5.5
security Fixes CVE-2026-103008: Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted request that causes the server to construct and process a deeply nested data structure with n… in 9.5.5
security Fixes CVE-2026-103005: Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user with connector management privileges… in 9.5.5
security Fixes CVE-2026-102404: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). A low-privileged authenticated user can submit a specially crafted q… in 9.5.5
security Fixes CVE-2026-102409: Uncontrolled Recursion (CWE-674) in Elasticsearch can allow an authenticated user with low privileges to terminate an Elasticsearch node, resulting in denial of service, via Excessive Allocation (C… in 9.5.5
security Fixes CVE-2026-102408: Inefficient Regular Expression Complexity (CWE-1333) in Elasticsearch can lead to denial of service via Regular Expression Exponential Blowup (CAPEC-492). The ES|QL CHUNK function's recursive chunk… in 9.5.5
security Fixes CVE-2026-103007: Incorrect Authorization (CWE-863) in Elasticsearch can lead to Privilege Escalation via a delegated administrative privilege whose scope is not fully enforced during authorization checks. Elasticse… in 9.5.4
security Fixes CVE-2026-94396: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130) in 9.5.4
security Fixes CVE-2026-94397: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130) in 9.5.4
security Fixes CVE-2026-94398: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130) in 9.5.4
security Fixes CVE-2026-94399: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130) in 9.5.4
security Fixes CVE-2026-82300: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). in 9.5.4
security Fixes CVE-2026-102411: Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to Denial of Service via Excessive Allocation (CAPEC-130). Elasticsearch enforces a size limit on the user-s… in 9.5.3
security Fixes CVE-2026-82294: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). in 9.5.3
security Fixes CVE-2026-94408: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130) in 9.5.3
security Fixes CVE-2026-103006: Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted, deeply nested request submitted to the aggregation feature of the search API. Elasticsearch… in 9.5.2
security Fixes CVE-2026-72642: The native inference process that Elasticsearch uses to evaluate uploaded machine learning models accepts a model operation that computes a memory address from an offset supplied inside the model,… in 9.5.1
security Fixes CVE-2026-72686: A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single request containing a crafted user-supplied input. A specific internal component validates the input using a rec… in 9.5.1
security Fixes CVE-2026-72687: A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single small request containing a forged opaque identifier. Elasticsearch decodes and deserializes the identifier befo… in 9.5.1
security Fixes CVE-2026-72678: Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read pri… in 9.5.1
security Fixes CVE-2026-72639: Elasticsearch does not enforce an upper bound on a user-supplied count accepted by a search highlighting option, and the allocation derived from that count is not accounted against any circuit brea… in 9.5.1
security Fixes CVE-2026-72645: Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user holding only read privileges on a si… in 9.5.1

Every release in between

9.5.6 Nov 2, 2026 Release notes ↗

featureESQL:DS: Authorize datasets named by received compute plans #162687

featureBump bundled JDK to 27.0.1.0.2 #163046

featureBump bundled JDK to 27.0.1.0.3 #163627

featureUpgrade Jackson to 2.21.8 #163710

featureUpgrade to lucene 10.5.2 #161372

featureAdd EuroBERT and Jina v5 ops to graph validation allowlist #3015

featureBetter error handling regarding quantiles state documents #2894

featureBetter handling of invalid JSON state documents #2895

featureBetter messaging regarding OOM process termination #2841

featureDowngrade log severity for a batch of recoverable errors #2889

featureHarden pytorch_inference with TorchScript model graph validation #3008 (issue: #2890)

featureImprove adherence to memory limits for the bucket gatherer #2848

featureReport the actual memory usage of the autodetect process #2846

featureUpdate the PyTorch library to version 2.7.1 #2863

featureMake GCS Storage retry on SSL exception #161154

featureBump lz4 to 1.11.4 #161406

featureBump snappy-java to 1.1.10.11 #161310

featureUpdate jsoup to 1.23.2 #160619

featureUpgrade Bouncy Castle to 1.86 #161326

featureUpgrade bcutil-fips to 2.0.8 #162600

featureUpgrade reactor-core to 3.8.7 #160494

featureAdd legacy_content_md5 S3 client setting #162197

fixReject non-positive size in composite aggregation #163307 (issue: #163038)

fixFail AllocationActionListener delegate only once #162309 (issues: #160180, #152475)

fixBound heap/allocation growth in analysis-phonetic #159667

fixFix streamed requests with secondary authentication being dispatched off the network thread #162171

fixApply field visibility to constant_keyword #159351

fixFix count drift in multi-valued binary index sort at flush #162228

fixAvoid quadratic failed response size when failure store redirects fail #162017 (issue: #157859)

fixShow the effective index mode and settings of the next backing index in GET _data_stream, and honor settings that a request explicitly unsets. #161250 (issue: #125685)

fixTSDB: not all documents with invalid timestamps are redirected to the failure store #161117 (issue: #161001)

fixDon't return unassigned shards in primary shard routing iterator #160492

fixHandle IndexShardClosedException and shutdown in ReplicationOperation::updateCheckPoints #162378 (issue: #158303)

fixMake downsample resume from the last indexed tsid work #162669

fixAvoid nested listeners in doc-partitioning cache #158910

fixBind ES|QL lookup requests to their target shard #162521

fixCache output #161282

fixCatch REPLACE regex StackOverflowError #157957

fixCircuit-break before growing the array #160592

fixCount only distinct warnings towards the cap #161338 (issues: #161319, #148398)

+83 more items in the release notes

9.5.5 Oct 6, 2026 Release notes ↗

securityFixes CVE-2026-103009: Authorization Bypass Through User-Controlled Key (CWE-639) in Elasticsearch can lead to Information Disclosure via a specially crafted cross-cluster search request that references an unauthorized s…

securityFixes CVE-2026-103008: Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted request that causes the server to construct and process a deeply nested data structure with n…

securityFixes CVE-2026-103005: Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user with connector management privileges…

securityFixes CVE-2026-102404: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). A low-privileged authenticated user can submit a specially crafted q…

securityFixes CVE-2026-102409: Uncontrolled Recursion (CWE-674) in Elasticsearch can allow an authenticated user with low privileges to terminate an Elasticsearch node, resulting in denial of service, via Excessive Allocation (C…

securityFixes CVE-2026-102408: Inefficient Regular Expression Complexity (CWE-1333) in Elasticsearch can lead to denial of service via Regular Expression Exponential Blowup (CAPEC-492). The ES|QL CHUNK function's recursive chunk…

featureLimit the multi_terms aggregation to a maximum of 128 fields #157906

featureAdd the manage, create_index, read, index, write, and delete privileges on third-party agent indices to the kibana_system role #160185

featureUpgrade the Parquet Hadoop bundle dependency #158981

featureUpgrade zstd-jni to 1.5.7-16 #159621

featurePass the reasoning effort setting through to OpenAI chat completion requests #156505

featureUpgrade Jackson to 2.21.7 #160501

featureUpgrade Netty to 4.1.138.Final #159561

fixFix replica divergence on indices that have sequence numbers disabled #158870 (issue: #150408)

fixPrevent the allocation explain API from starting gateway shard data fetches #157766 (issue: #155449)

fixAdd circuit breaker accounting to the Base64 functions, MV_CONCAT, and MV_ZIP #159659

fixClear Parquet and ORC filter state between query reuse cycles #158155

fixDisallow full text functions after UNION ALL when one of its branches contains a top N operation #158578

fixFix a ClassCastException in Parquet late-materialization filters when a predicate batch contains only null values #157587 (issue: #157313)

fixFix METADATA behavior with subqueries and logical views #157233 (issue: #160116)

fixFix a NullPointerException when folding a regular expression #158768 (issue: #158748)

fixFix TO_STRING being ignored in MATCH and MATCH_PHRASE on indexed fields #159416 (issue: #159395)

fixFix TO_TEXT being ignored in MATCH and MATCH_PHRASE on indexed fields #159269 (issue: #159265)

fixFix handling of the isPartial flag #157475 (issue: #157440)

fixFix an analyzer loop caused by repeated conversions #159257

fixFix nested fields conflicting with object fields #158573 (issue: #154011)

fixRead partition_detection and partition_path on the query path #157208

fixReject TRANGE queries that have a null start or offset #159125

fixReturn a warning instead of failing on cumulative T-Digests #160534

fixReturn a warning when a GROK typed conversion fails #160574 (issue: #160564)

fixHandle refresh exceptions in ensureShardSearchActive #159526

fixLimit the length of connector descriptions #159638

fixLimit geometry nesting depth when a geometry is constructed #160004

fixFix edge selection in the H3 great-circle latitude correction #160228 (issue: #159682)

fixConvert RecursiveChunker to an iterative implementation and cap the size of its separator list #158589

fixClear buffer files at startup #159701

fixAllow multipage PDFs in the semantic field #159641 (issue: #158773)

fixDetect level changes that coincide with the detection of new seasonality #3209 (issue: #2730)

fixStabilize uncertain trend forecasts #3189 (issue: #2772)

fixResolve high-cardinality keyword queries to ScanningBinaryDocValuesAutomatonQuery #158603 (issue: #158597)

+13 more items in the release notes

9.5.4 Sep 15, 2026 Release notes ↗

securityFixes CVE-2026-103007: Incorrect Authorization (CWE-863) in Elasticsearch can lead to Privilege Escalation via a delegated administrative privilege whose scope is not fully enforced during authorization checks. Elasticse…

securityFixes CVE-2026-94396: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130)

securityFixes CVE-2026-94397: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130)

securityFixes CVE-2026-94398: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130)

securityFixes CVE-2026-94399: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130)

securityFixes CVE-2026-82300: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130).

featureAdd manage, create_index, read, index, write, delete, permission for third party agent indices kibana_system #156029

featureUpgrade Jackson to 2.21.6 #157295 (issue: #141442)

featureAdd EuroBERT and Jina v5 ops to graph validation allowlist #3015

featureBetter error handling regarding quantiles state documents #2894

featureBetter handling of invalid JSON state documents #2895

featureBetter messaging regarding out of memory process termination #2841

featureDowngrade log severity for a batch of recoverable errors #2889

featureHarden pytorch_inference with TorchScript model graph validation #3008 (issue: #2890)

featureImprove adherence to memory limits for the bucket gatherer #2848

featureReport the actual memory usage of the autodetect process #2846

featureUpdate the PyTorch library to version 2.7.1 #2863

featureApply _msearch memory bounds, cancellation, and metrics to _msearch/template API #157642

featureImprove vector search calibration performance #153577

fixBound min_hash filter parameters to prevent out of memory errors #154480

fixCap min_hash filter parameters to a valid range #158211

fixReject allow_restricted_indices=true consistently in roles granted by users with the manage_roles privilege #158831

fixFix synthetic _id Terms#getMax crash during relocation id-lookup prewarm #158537

fixAdd doc-values fallback for unsigned_long queries #158545

fixFix incorrect results with COUNT(mv_field) on not indexed numeric or date fields #158381

fixReturn 400 for unresolved MMR query vector #158301 (issue: #157876)

fixWhen reversing strings, treat carriage return line feed (CRLF) as a single control character, in line with UTF guidelines #158745

fixFix null pointer exception in Amazon Bedrock chat completion when a message has no content #158527 (issue: #158521)

fixFail closed on incomplete TorchScript pre-load state-hook scan #3149

fixFail gracefully when restoring a categorizer with an out of range token ID #3143

fixFix flaky concurrent least frequently used (LFU) cache count invariant under lock timeouts #3090

fixHarden the Linux system call filter for machine learning native processes to block non-native instruction set variants #3080

fixMark machine learning controller non-dumpable before accepting commands #3081

fixPrevent anomaly detection job reopen from exhausting search scroll contexts during mass reassignment #154925 (issue: #153260)

fixReject TorchScript custom state hooks before load and forbid inductor::_reinterpret_tensor #3078

fixReturn HTTP 4xx status codes when machine learning nodes are exhausted #155310

fixFix LIKE/RLIKE list of patterns returning wrong results on non-indexed keyword fields and errors on wildcard fields #158228

fixFix missing counts in contains mapper query #158187

fixFix knn query pre-filtering for exists queries on inference fields #158296 (issue: #157951)

fixGuard against oversized protobuf requests causing out of memory failures #157968

+3 more items in the release notes

9.5.3 Sep 3, 2026 Release notes ↗

securityFixes CVE-2026-102411: Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to Denial of Service via Excessive Allocation (CAPEC-130). Elasticsearch enforces a size limit on the user-s…

securityFixes CVE-2026-82294: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130).

securityFixes CVE-2026-94408: Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130)

featureAdd request.raw_body to audit events for protobuf request bodies #158143

featureReject oversized request bodies when request-body auditing is enabled #157760

featureSpeed up vector quantization calibration during index merge #153577

fixLimit min_hash filter parameters to prevent integer overflow #158211

fixPrevent out-of-memory errors from extreme min_hash filter settings #154480

fixFix field-level security filtering for _field_names terms #157889

fixPrevent indexing-pressure rejections from stopping an entire bulk shard request #158235 (issue: #158212)

fixFix BYTE_LENGTH returning 0 for keyword fields in columnar mode #157858

fixFix incorrect MV_MIN and MV_PERCENTILE results in columnar mode #157857 (issue: #157817)

fixFix data stream auto-sharding using stale index settings #157634 (issue: #134505)

fixFix MV_MIN and MV_MAX on ip fields in columnar mode #157790 (issue: #157521)

fixFix ROUND overflowing integer values when used with negative precision #156412 (issue: #156411)

fixFix TS STATS dropping constant literal aggregates #157148 (issue: #157103)

fixFix failures in string functions that use extracted fields #156980

fixFix failures when reading _ignored_source out of document order #157798

fixFix query failures when a multi-field sub-field has conflicting types across indices #156326

fixFix translog resource leaks and leftover upload tasks on node shutdown #149429 (issue: #149343)

fixFix secret rotation in the inference _update API #157214

fixReject a blank datafeed ID in stop datafeed requests #157929

fixReject a blank job ID in close job requests #158020

fixReport skipped clusters in datafeed stats after a cross-cluster search failure #157567

fixFix composite aggregations returning no buckets on logsdb timestamp fields #158060 (issue: #158008)

fixFix contains queries failing on single-valued keyword fields #158187

fixFix search crashes from empty collect ranges in doc-values queries #157630

fixFail reindex tasks that cannot relocate during node shutdown #150342 (issues: #150294, #150295)

fixFix the SQL INSERT function ignoring the result size limit #157752

fixFix kNN automatic pre-filtering for exists queries on inference fields #158296 (issue: #157951)

fixSpeed up _shard_doc search_after pagination by applying sort pruning #157044 (issue: #155559)

fixFix leaking cancellation tasks in incremental bulk indexing #158108 (issue: #158018)

fixReduce memory usage when retrieving component and composable templates #158175

fixFix reading bfloat16 values from older index formats with different endianness #157730 (issue: #157696)

fixRestore early-exit scoring across segments for IVF search #157229

9.5.2 Aug 20, 2026 Release notes ↗

securityFixes CVE-2026-103006: Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to Denial of Service via a specially crafted, deeply nested request submitted to the aggregation feature of the search API. Elasticsearch…

featureUpgrade Bouncy Castle FIPS to 1.0.2.7 and 2.0.2 #156296

featureUpgrade ASM to 9.10.1 #156213

featureUpgrade the bundled JDK to 26.0.2 #156203

featureUpgrade to Lucene 10.5.1 #156643

featureUpgrade Jackson to 2.21.5 for ES|QL and Arrow #156368

fixFix rank estimation ignoring min and max in exponential histograms #156268 (issue: #156057)

fixFix duplicate field in the cumulative histogram reset document #156287 (issue: #156276)

fixAccount for deferred aggregation memory in the request circuit breaker #155600 (issue: #148516)

fixAccount for t-digest percentiles memory in the request circuit breaker #155586

fixFix TS STATS aggregate aliases that collide with grouping keys #155312 (issue: #153507)

fixFix TS queries that name a time bucket after the timestamp field #155623

fixFix incorrect results from Parquet predicate pushdown on multi-valued fields #156604

fixReplace an IN subquery evaluated as a false filter with an empty local relation #155648 (issue: #155563)

fixFix Anthropic translation to the unified schema #155314

fixFix Google Vertex AI tool calls with non-string argument values #156665 (issue: #156644)

fixFix inference and security cache clearing on multi-node clusters #156603

fixTranslate unified tool-calling message blocks to the Anthropic format #154607

fixFix IllegalStateException when a truncated string cuts off in the middle of a JSON object #156382 (issue: #156289)

fixFail closed when the TorchScript state hook scan is incomplete #3149

fixFail gracefully when restoring a categorizer with an out-of-range token ID #3143

fixCount failed _msearch sub-search responses against the circuit breaker #156683

fixEnsure batched queries always return a response #155908

fixFail the request instead of the node on deeply nested aggregations #155745

fixFix nested and mode-based sorts on integer fields returning incorrect values on indices created before 8.19 or in 9.0.x #155580 (issue: #155243)

fixKeep scroll contexts on transient search queue rejection #155697 (issue: #90912)

fixLimit aggregation nesting depth with search.aggs.max_nested_depth #155743

fixReject null values in search_after instead of failing the search #132434 (issue: #132370)

fixStop returning a user field named _type as search hit metadata #155706 (issue: #110438)

fixHalt the node on fatal errors during S3 multipart uploads #156765

fixPreserve security headers when copying a transform configuration #156191

fixFix DOT_PRODUCT and COSINE score clamping in the BBQ vector scorer #156015 (issues: #156010, #156011, #156009, #156012)

fixFix search failures when many field patterns match no vector fields #156466

fixFix the auto_calibrate index option being rejected by a leftover experimental flag #156623

fixScore nested kNN inner_hits like the query phase #156332 (issue: #138496)

9.5.1 Aug 11, 2026 Release notes ↗

securityFixes CVE-2026-72642: The native inference process that Elasticsearch uses to evaluate uploaded machine learning models accepts a model operation that computes a memory address from an offset supplied inside the model,…

securityFixes CVE-2026-72686: A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single request containing a crafted user-supplied input. A specific internal component validates the input using a rec…

securityFixes CVE-2026-72687: A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single small request containing a forged opaque identifier. Elasticsearch decodes and deserializes the identifier befo…

securityFixes CVE-2026-72678: Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read pri…

securityFixes CVE-2026-72639: Elasticsearch does not enforce an upper bound on a user-supplied count accepted by a search highlighting option, and the allocation derived from that count is not accounted against any circuit brea…

securityFixes CVE-2026-72645: Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user holding only read privileges on a si…

featureUpdate Bouncy Castle FIPS TLS libraries #155937

featureUpgrade lz4-java to 1.11.1 #155598

featureAdd EuroBERT and Jina v5 ops to the graph validation allowlist #3015

featureDowngrade log severity for a batch of recoverable errors #2889

featureHarden pytorch_inference with TorchScript model graph validation #3008 (issue: #2890)

featureImprove adherence to memory limits for the bucket gatherer #2848

featureImprove error handling for quantiles state documents #2894

featureImprove handling of invalid JSON state documents #2895

featureImprove messaging for OOM process termination #2841

featureReport the actual memory usage of the autodetect process #2846

featureUpdate the PyTorch library to version 2.7.1 #2863

featureUpgrade Apache HttpComponents 5.x to address CVEs #153057

featureUpgrade Apache HttpCore 5 to 5.4.3 to fix header DoS CVEs #153467

featureUpgrade Bouncy Castle to 1.85 #155819

featureCache little-endian float layout in the DiskBBQ scalar corrections loop #154373

fixTrip the request breaker on term and phrase suggesters based on backing array estimates #154837

fixFix false positives in boolean queries with must_not clauses on non-indexed fields #155936 (issue: #155653)

fixAllow garbage collection of closed search contexts in ES|QL #155418

fixApply PropagateEmptyRelation to AbstractSubqueryJoin #154768 (issue: #154755)

fixFix BUCKET with very large bucket counts #153392 (issue: #153389)

fixFix FROM_BASE64 generating invalid non-UTF-8 strings. Previously it could create binary values that ES|QL does not support in other operations; only valid UTF-8 is supported, and invalid cases now return null with a warning. #154955

fixFix MV_SORT incorrectly allowing geospatial types, which are not sortable #154417

fixFix exponential histogram merging with zero bucket overlap #155459 (issue: #153665)

fixSupport dynamically enabling history indexes in ILMHistoryTemplateRegistry #155602 (issue: #141807)

fixUpgrade JANSI to 2.4.3 to fix terminal detection on zlib-ng based systems (EL10) #155853 (issue: #154510)

fixFix flaky CIoManagerTest/testFileIoGood test #3017

fixFix flaky concurrent LFU cache count invariant under lock timeouts #3090

fixMark the ML controller non-dumpable before accepting commands #3081

fixReject TorchScript custom state hooks before load and forbid inductor::_reinterpret_tensor #3078

fixReject non-native ABIs in the ML seccomp filter (socketcall/getuid collision) #3080

fixSupport date_nanos timestamp indices #153996 (issue: #146923)

fixClamp merge scheduler thread count when it exceeds max merge count #155693 (issues: #96594, #155678)

fixLimit dot-separated identifiers per version part #154572

fixParse scroll ID from a bounded byte array #154542

+2 more items in the release notes

9.5.0 Aug 4, 2026 Release notes ↗

featurelogsdb_columnar adds logging-oriented defaults on top of the columnar foundation: a default @timestamp mapping, and index sorting on host.name and @timestamp when those fields are present.

featurecolumnar provides the same column-oriented storage without use-case-specific defaults, suitable for general-purpose indices and data streams.

featureEarly publish DesiredBalance when newly created replicas are assigned #149645

featureExpose DesiredBalanceStats as metrics #146928

featureAllow appending synonyms to existing rules via append=true (default false) #146870 (issue: #146864)

featureAllow multiple synonym sets per filter using the synonyms API #147157 (issue: #144941)

featureAllow audit logging to be turned on/off without server restart #147333

featureChange federated feature flag to cluster config #153098

featureIntroduce feature flag for keyless auth #152684

featureProvide default jwt_audience #152362

feature[Evaluations] Register .evaluation-* as hidden indices with viewer/editor access #148880

featureSupport -remote:index-style exclusion syntax #148497

featureExpand index pressure on update expansion #147151

featureMinimize the amount of memory used by CommitReferencesInfo #147976

featureUpdate to lucene 10.5 #151959

featureUse IOContext to detect random access for bloom filters #147224

featureWrite skipindex to a separate file in TSDB Codec #147238

featureAdding dynamic template for *.lifecycle.last_activity fields #149505

featureAllow deleting a backing index via modify data streams API #151137

featureData stream lifecycle (DLM) can move data to the frozen tier #150457

featureThrottle concurrent downsampling operations in data stream lifecycle. A new dynamic cluster setting, data_streams.lifecycle.downsampling.max_indices_in_progress (default 10), caps the number of backing indices per data stream that data stream lifecycle will submit to downsampling in a single run.…

featureUpdating ecs@mappings to include new flattened gen_ai fields #148674

feature[otel-data] Add HTTP body size, severity aliases #152622

featureImprove allocation explain API for canRemain #152121 (issue: #131603)

featureMake INDICES_RECOVERY_MAX_CONCURRENT_OUTGOING_RECOVERIES setting dynamic #151138

featureSupport outbound peer recovery throttling #149319

featureAssign downsampling to least loaded candidate node #148220

featureAdd Arrow output support for date_nanos and date_range data types #150479 (issue: #146350)

featureAdd ENRICH to bytes counting #150677

featureAdd IP_LOCATION command #149421 (issues: #150231, #132489)

featureAdd range_intersects and range_contains functions #148713

featureAdd a BY subclause to CHANGE_POINT command #148473

featureAdd analyzer option in ES|QL TOP_SNIPPETS function #147369

featureAdd order option to TOP_SNIPPETS #145946

featureAdd release hook to Vector and Block #150017

featureAvoid tracking group ids for intermediate input #141466

featureBulk-grow TopN UTF-8 string encoding #149022

featureCache FilterOperator/EvalOperator toString #148354

featureChunk time-series aggregation output #151670 (issue: #147286)

featureConstant-RHS fast path for MOD and DIV evaluators #148678

+397 more items in the release notes

9.4.9 Nov 2, 2026 Release notes ↗