OpenSearch Release Notes

1.3.6

1.3.6_23.2.1_0726

Restricted use

2023.07

1.3.6_23.3.1_0824

Restricted use

2023.09

1.3.6_23.5.0_1213

Restricted use

2023.12

1.3.6_23.5.1_0123

Restricted use

2024.01

1.3.6_24.1.0_0410

Restricted use

2024.05

1.3.6_24.2.0_0615

Restricted use

2024.06

1.3.6_24.3.0_0920

Restricted use

2024.09

1.3.6_24.3.1_1114

Restricted use

2024.11

1.3.6_24.3.3_1225

Restricted use

2024.12

1.3.6_25.1.0_0227

Restricted use

2025.03

1.3.6_25.3.0_0407

Restricted use

2025.05

1.3.6_25.6.0_0814

Restricted use

2025.08

1.3.6_25.9.0_1210

Restricted use

2025.12

1.3.6_26.1.0_0402

Restricted use

2026.04

2.11.0

2.11.0_23.5.1_0113

Restricted use

2024.01

2.11.0_24.1.0_0410

Restricted use

2024.05

2.11.0_24.2.0_0615

Restricted use

2024.06

2.11.0_24.3.0_0920

Restricted use

2024.09

2.11.0_24.3.1_1114

Restricted use

2024.11

2.11.0_25.1.0_0227

Restricted use

2025.03

2.11.0_25.3.0_0407

Restricted use

2025.05

2.11.0_25.6.0_0814

Restricted use

2025.08

2.11.0_26.1.0_0204

Restricted use

2026.04

2.17.1

2.17.1_24.3.2_1122

Restricted use

2024.11

2.17.1_25.1.0_0227

Restricted use

2025.03

2.17.1_25.3.0_0407

Restricted use

2025.05

2.17.1_25.6.0_0814

Restricted use

2025.08

2.17.1_26.1.0_0204

Restricted use

2026.04

2.19.0

2.19.0_25.6.0_0814

Commercial use

2025.08

2.19.0_25.6.1_0904

Commercial use

2025.09

2.19.0_25.6.3_0916

Commercial use

2025.09

2.19.0_25.9.0_1210

Commercial use

2025.12

2.19.0_26.1.0_0327

Commercial use

2026.04

3.4.0

3.4.0_26.1.0_0407

Commercial use

2026.04

3.4.0_26.1.0_0407

This new version integrates the unique enhancements of CSS into the open-source OpenSearch 3.4.0 release. In terms of unique CSS enhancements, only storage-compute decoupling and tiered storage are currently supported.

2.19.0_26.1.0_0327

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 a spelling error in the name of an index-level monitoring item: changed totol_docs_delete to total_docs_delete.
• Added the rescore parameter for configuring vector search. This parameter can be used to enable rescoring/reranking.

2.19.0_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 OpenSearch Dashboards availability and health check.
• Fixed the following issue: The map page cannot be saved due to incorrect Kibana mapping.
• Added support for the High Level Rest Client (elasticsearch-rest-high-level-client) that comes with Elasticsearch 7.x.
• Added support for password validity period management and machine-machine account management.
• Added support for node-level query traffic isolation.
• Added support for JDK SIMD optimization.
• 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.
• 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.
• Fixed the following issue: Following a cluster restart, data fails to be written into primary shards. This issue occurs at a low probability

2.19.0_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.

2.19.0_25.6.1_0905

New features and performance enhancements:

• Resolved the following issue: Query Insights sometimes causes cluster access requests to get stuck.
• Enabled Elasticsearch client compatibility by default.
• Resolved the following issue: synchronization of matched indexes fails for the read/write splitting plugin.

2.19.0_25.6.0_0814

Added the new version OpenSearch 2.19.0. This version integrates the unique enhancements of CSS into the open-source OpenSearch 2.19.0 release.

2.17.1_26.1.0_0204

New features and performance enhancements:

• Upgraded the base image version.
• Optimized disk and striped storage configuration for nodes.
• Increased the timeout for _cluster/health API requests during node health checks.
• 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.

2.17.1_25.6.0_0814

Upgraded the base image version.

2.17.1_25.3.0_0407

The same as OpenSearch 2.17.1 in the open-source community.

1.3.6_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.

1.3.6_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 OpenSearch Dashboards availability and health check.
• Added support for the High Level Rest Client (elasticsearch-rest-high-level-client) that comes with Elasticsearch 7.x and 8.x.
• Fixed the following issue: Indexes previously associated with the ism_template, after they are removed, are automatically re-associated with the template.
• 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.

1.3.6_25.6.0_0814

New features and performance enhancements:

• Removed sensitive information from ClusterState for OpenSearch clusters.
• Optimized permission control for the security plugin.
• 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: when a process is restarted to rectify OpenSearch parameter errors, its status flag is incorrectly set to successful.

1.3.6_25.3.0_0407

New features and performance enhancements:

• Removed residual settings for plugins when restoring indexes.
• 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.
• Added write failure monitoring.
• Added the Pangu search plugin to implement semantic search.
• Fixed the following issue: The IK dictionary file may not take effect on new nodes upon an upgrade or scale-out operation.

1.3.6_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.

• Fixed the following issue: Process restart may occur when a _msearch query is canceled.