Elasticsearch Release Notes

5.5.1

5.5.1_22.5.1_0106

Restricted use

2023.01

5.5.1_22.5.2_0302

Restricted use

2023.03

5.5.1_23.1.1_0427

Restricted use

2023.05

5.5.1_23.2.1_0719

Restricted use

2023.07

5.5.1_23.3.1_0823

Restricted use

2023.09

6.2.3

6.2.3_22.5.1_0106

Restricted use

2023.01

6.2.3_22.5.2_0302

Restricted use

2023.03

6.2.3_23.1.1_0427

Restricted use

2023.05

6.2.3_23.2.1_0719

Restricted use

2023.07

6.2.3_23.3.1_0823

Restricted use

2023.09

6.2.3_24.2.0_0615

Restricted use

2024.06

6.2.3_24.3.0_0920

Restricted use

2024.09

6.2.3_24.3.1_1114

Restricted use

2024.11

6.2.3_25.3.0_0407

Restricted use

2025.05

6.2.3_25.6.0_0708

Restricted use

2025.08

6.2.3_26.1.0_0204

Restricted use

2026.04

6.5.4

6.5.4_22.5.1_0106

Restricted use

2023.01

6.5.4_22.5.2_0302

Restricted use

2023.03

6.5.4_23.1.1_0427

Restricted use

2023.05

6.5.4_23.2.1_0719

Restricted use

2023.07

6.5.4_23.3.1_0823

Restricted use

2023.09

6.5.4_24.2.0_0615

Restricted use

2024.06

6.5.4_24.3.0_0920

Restricted use

2024.09

6.5.4_24.3.1_1114

Restricted use

2024.11

6.5.4_25.3.0_0407

Restricted use

2025.05

6.5.4_25.6.0_0730

Restricted use

2025.08

6.5.4_26.1.0_0204

Restricted use

2026.04

7.1.1

7.1.1_22.5.1_0106

Restricted use

2023.01

7.1.1_22.5.2_0302

Restricted use

2023.03

7.1.1_23.1.1_0427

Restricted use

2023.05

7.1.1_23.2.1_0719

Restricted use

2023.07

7.1.1_23.3.1_0823

Restricted use

2023.09

7.1.1_24.2.0_0625

Restricted use

2024.06

7.1.1_24.3.0_0920

Restricted use

2024.09

7.1.1_24.3.1_1114

Restricted use

2024.11

7.1.1_25.3.0_0407

Restricted use

2025.05

7.1.1_25.6.0_0708

Restricted use

2025.08

7.1.1_26.1.0_0204

Restricted use

2026.04

7.6.2

7.6.2_22.5.1_0106

Restricted use

2023.01

7.6.2_22.5.2_0302

Restricted use

2023.03

7.6.2_23.1.1_0523

Restricted use

2023.05

7.6.2_23.2.1_0726

Restricted use

2023.07

7.6.2_23.3.1_0904

Restricted use

2023.09

7.6.2_23.5.0_1212

Restricted use

2023.12

7.6.2_23.5.1_0123

Restricted use

2024.01

7.6.2_24.1.0_0410

Restricted use

2024.05

7.6.2_24.2.0_0615

Restricted use

2024.06

7.6.2_24.3.0_0927

Restricted use

2024.09

7.6.2_24.3.1_1114

Restricted use

2024.11

7.6.2_24.3.3_1225

Restricted use

2024.12

7.6.2_25.1.0_0227

Restricted use

2025.03

7.6.2_25.3.0_0506

Restricted use

2025.05

7.6.2_25.6.0_0814

Restricted use

2025.08

7.6.2_25.6.3_0916

Restricted use

2025.09

7.6.2_25.9.0_1210

Restricted use

2025.12

7.6.2_26.1.0_0402

Restricted use

2026.04

7.9.3

7.9.3_22.5.1_0106

Restricted use

2023.01

7.9.3_22.5.2_0302

Restricted use

2023.03

7.9.3_23.1.1_0427

Restricted use

2023.05

7.9.3_23.2.1_0719

Restricted use

2023.07

7.9.3_23.3.1_0823

Restricted use

2023.09

7.9.3_24.2.0_0625

Restricted use

2024.06

7.9.3_24.3.0_0920

Restricted use

2024.09

7.9.3_24.3.1_1114

Restricted use

2024.11

7.9.3_25.3.0_0407

Restricted use

2025.05

7.9.3_25.6.0_0708

Restricted use

2025.08

7.9.3_26.1.0_0204

Restricted use

2026.04

7.10.2

7.10.2_22.5.1_0106

Commercial use

2023.01

7.10.2_22.5.2_0302

Commercial use

2023.03

7.10.2_22.5.4_0427

Commercial use

2023.04

7.10.2_23.1.1_0523

Commercial use

2023.05

7.10.2_23.2.1_0726

Commercial use

2023.07

7.10.2_23.3.1_0904

Commercial use

2023.09

7.10.2_23.3.3_1019

Commercial use

2023.10

7.10.2_23.5.0_1212

Commercial use

2023.12

7.10.2_23.5.1_0123

Commercial use

2024.01

7.10.2_24.1.0_0410

Commercial use

2024.05

7.10.2_24.2.0_0625

Commercial use

2024.06

7.10.2_24.2.1_0720

Commercial use

2024.07

7.10.2_24.3.0_0927

Commercial use

2024.09

7.10.2_24.3.1_1114

Commercial use

2024.11

7.10.2_24.3.2_1127

Commercial use

2024.11

7.10.2_24.3.3_0102

Commercial use

2024.12

7.10.2_24.3.4_0116

Commercial use

2025.01

7.10.2_25.1.0_0227

Commercial use

2025.03

7.10.2_25.3.0_0507

Commercial use

2025.05

7.10.2_25.6.0_0814

Commercial use

2025.08

7.10.2_25.6.3_0916

Commercial use

2025.09

7.10.2_25.9.0_1211

Commercial use

2025.12

7.10.2_26.1.0_0402

Commercial use

2026.04

7.10.2_26.1.0_0402

New features and performance enhancements:

• Upgraded the base image version.
• Added the ability to monitor transport_worker and business_worker task counts.
• Optimized the _cluster/settings API so it will no longer obtain the full cluster state.
• Optimized the can_match phase: switched from shard-level to node-level request processing.
• Fixed the following issue: Requests are blocked when Accept-Encoding: zstd is used in the request header.
• Fixed a spelling error in the name of an index-level monitoring item.
• Added the rescore parameter for configuring vector search. This parameter can be used to enable rescoring/reranking.

7.10.2_25.9.0_1211

New features and performance enhancements:

• ISM reliability hardening: added support for automatic retry of failed tasks.
• ISM rollover optimization: auto rollover can be disabled for empty indexes.
• Optimized disk and striped storage configuration for nodes.
• Added Kibana availability and health check.
• Added support for password validity period management and machine-machine account management.
• Added support for node-level query traffic isolation.
• Changed some static parameters into dynamic parameters.
• Fixed the following issue: sometimes vectors fail to be generated for bulk deletion operations; added support for batch settings for the search model.
• Enhanced the read/write splitting feature.
• Fixed the following issue: Indexes previously associated with the ism_template, after they are removed, are automatically re-associated with the template.
• Added support for querying top N queries.
• Fixed the following issue: For a security-mode cluster, the first request during each hour incurs an additional latency of 300 ms.
• Any attempt to enable read/write splitting for a frozen index will be blocked.
• Any attempt to freeze a vector index or an index with read/write splitting enabled will be blocked.
• Optimized asynchronous closing of index shards.

7.10.2_25.6.3_0916

New features and performance enhancements:

Resolved the following issue: reverse synchronization fails after "setting" is enabled for the read/write splitting plugin.

7.10.2_25.6.0_0814

New features and performance enhancements:

• Added the elasticsearch-analysis-vietnamese plugin.
• Removed sensitive information from ClusterState for Elasticsearch clusters.
• Optimized the deduplication function for HPACK graph indexes.
• Enhanced ISM reliability concerning the circuit breaker mechanism.
• Resolved the following issue: lifecycle management tasks cannot be executed once the disk space usage exceeds 95%.
• Resolved the following issue: the backup and restoration plugin occasionally fails to create a repository.
• Resolved the following issue: admin permissions are lost after the built-in role mapping is modified.
• Resolved the following issue: indexes that are in the index recycle bin are not automatically deleted upon expiration.
• Resolved the following issue: the index monitoring plugin sometimes cannot obtain the index status.
• Optimized security mode switching for existing clusters. Resolved the following issue: the security mode fails to be changed when the cluster has a large number of index shards.
• Added the online web search function for the pg_search plugin, which supports OpenAI's embedding and reranking APIs.
• Resolved the following issue: IP addresses that are already blacklisted can still send requests.

7.10.2_25.3.0_0507

New features and performance enhancements:

• Removed residual settings for plugins when restoring indexes.
• Fixed the following issue: The SQL plugin may cause some nodes to restart.
• Fixed the following issue: The breaker of a security-mode cluster is inconsistent with the Elasticsearch design.
• Optimized node lockout mechanism: To prevent specific nodes from being locked due to repeated incorrect password attempts, add their IP addresses to a whitelist.
• Fixed the following issue: Occasionally, the file descriptor remains allocated after a Kibana log file is deleted.
• Optimized compatibility with clients of versions 7.x and 8.x.
• Added support for a custom QueryPhase plugin. Vector indexes support parallel searches across segments.
• Added write failure monitoring.
• Fixed the following issue: The lifecycle plugin may cause upgrade failures.
• Fixed the following issue: The error "topDocs already consumed" may occur when sorting is performed.
• Optimized the error message displayed when decoupled storage and compute (index freezing) is used for a non-existent index.
• Fixed the following issue: The IK dictionary file may not take effect on new nodes upon an upgrade or scale-out operation.
• Fixed the following issue: Kibana cannot deliver password change requests due to an incorrect UI string (Chinese).
• Supports a retry mechanism for OBS access by the hpack vector plugin.
• Fixed the following issue: A 6.x security-mode cluster may fail to be upgraded to 7.10.2.
• Fixed the following issue: Elasticsearch processes may fail to restart with the error "alias has more than one write index."
• Kibana basePathAlias can contain -_.

7.10.2_25.1.0_0227

New features and performance enhancements:

• Added a node alarm to indicate abnormality of the filesystem tune2fs.
• Fixed the following issue: File handles may fail to be released promptly during log ingestion.
• Vector search supports indexing algorithms GRAPH_SQ4 and GRAPH_SQ8.
• The index lifecycle plugin supports skipping the rollover step.
• Fixed the following issue for the storage-compute decoupling plugin: An incompatibility issue may occur during upgrade due to obs_index_allocator.
• Fixed the following issue: Process restart may occur when a _msearch query is canceled.

7.6.2_26.1.0_0402

New features and performance enhancements:

• Upgraded the base image version.
• Optimized security mode switching for existing clusters. Resolved the following issue: the security mode sometimes fails to be changed when the cluster has a large number of index shards.
• Fixed a spelling error in the name of an index-level monitoring item.

7.6.2_25.9.0_1210

New features and performance enhancements:

• ISM reliability hardening: added support for automatic retry of failed tasks.
• ISM rollover optimization: auto rollover can be disabled for empty indexes.
• Optimized disk and striped storage configuration for nodes.
• Added Kibana availability and health check.
• Fixed the following issue: For a security-mode cluster, the first request during each hour incurs an additional latency of 300 ms.
• Any attempt to enable read/write splitting for a frozen index will be blocked.
• Any attempt to freeze a vector index or an index with read/write splitting enabled will be blocked.

7.6.2_25.6.3_0916

New features and performance enhancements:

• Resolved the following issue: reverse synchronization fails after "setting" is enabled for the read/write splitting plugin.
• Elasticsearch is compatible with SDKs of later versions.

7.6.2_25.6.0_0814

New features and performance enhancements:

• Removed sensitive information from ClusterState for Elasticsearch clusters.
• Resolved the following issue: the backup and restoration plugin occasionally fails to create a repository.
• Resolved the following issue: admin permissions are lost after the built-in role mapping is modified.
• Resolved the following issue: IP addresses that are already blacklisted can still send requests.
• Resolved the following issue: the index monitoring plugin sometimes cannot obtain the index status.
• Enhanced ISM reliability concerning the circuit breaker mechanism.

7.6.2_25.3.0_0506

7.6.2_25.1.0_0227

New features and performance enhancements:

• Added a node alarm to indicate abnormality of the filesystem tune2fs.
• The index lifecycle plugin supports skipping the rollover step. Fixed the following issue: If an index name contains minutes, the rollover alias may fail to be updated.
• Fixed the following issue for the storage-compute decoupling plugin: An incompatibility issue may occur during upgrade due to obs_index_allocator.
• Fixed the following issue: Process restart may occur when a _msearch query is canceled.