add release note for 3.1 (opensearch-project#3902)

* initial release note template

Signed-off-by: Brian Flores <[email protected]>

* first round of commit entries in main

The latest commit being 'Add custom SSE endpoint for the MCP Client (opensearch-project#3891)'

Signed-off-by: Brian Flores <[email protected]>

* add commits from June 10th

Signed-off-by: Brian Flores <[email protected]>

* add commits from June 11th

Signed-off-by: Brian Flores <[email protected]>

* move blueprint from enhancement to Documentation

Signed-off-by: Brian Flores <[email protected]>

---------

Signed-off-by: Brian Flores <[email protected]>
Co-authored-by: Dhrubo Saha <[email protected]>

Author: brianf-aws

release-notes/opensearch-ml-common.release-notes-3.1.0.0.md

@@ -0,0 +1,46 @@
+## Version 3.1.0.0 Release Notes
+
+Compatible with OpenSearch 3.1.0.0
+
+### Enhancements
+* Support persisting MCP tools in system index (#3874)[https://github.com/opensearch-project/ml-commons/pull/3874]
+* [Agent] PlanExecuteReflect: Return memory early to track progress (#3884)[https://github.com/opensearch-project/ml-commons/pull/3884]
+* Add space type mapping for pre-trained embedding models, add new additional_config field and BaseModelConfig class (#3786)[https://github.com/opensearch-project/ml-commons/pull/3786]
+* support customized message endpoint and addressing comments (#3810)[https://github.com/opensearch-project/ml-commons/pull/3810]
+* Add custom SSE endpoint for the MCP Client (#3891)[https://github.com/opensearch-project/ml-commons/pull/3891]
+* Expose Update Agent API (#3820)[https://github.com/opensearch-project/ml-commons/pull/3902]
+* Use function calling for existing LLM interfaces (#3888)[https://github.com/opensearch-project/ml-commons/pull/3888]
+* Add error handling for plan&execute agent (#3845)[https://github.com/opensearch-project/ml-commons/pull/3845]
+* Metrics framework integration with ml-commons (#3661)[https://github.com/opensearch-project/ml-commons/pull/3661]
+
+### Bug Fixes
+* Fix connector private IP validation when executing agent without remote model (#3862)[https://github.com/opensearch-project/ml-commons/pull/3862]
+* for inline model connector name isn't required (#3882)[https://github.com/opensearch-project/ml-commons/pull/3882]
+* fix the tutorial in AIConnectorHelper when fetching domain_url (#3852)[https://github.com/opensearch-project/ml-commons/pull/3852]
+* Adds Json Parsing to nested object during update Query step in ML Inference Request processor (#3856)[https://github.com/opensearch-project/ml-commons/pull/3856]
+* adding / as a valid character (#3854)[https://github.com/opensearch-project/ml-commons/pull/3854]
+* quick fix for guava noclass issue (#3844)[https://github.com/opensearch-project/ml-commons/pull/3844]
+* Fix python client not able to connect to MCP server issue (#3822)[https://github.com/opensearch-project/ml-commons/pull/3822]
+* excluding circuit breaker for Agent (#3814)[https://github.com/opensearch-project/ml-commons/pull/3814]
+* adding tenantId to the connector executor when this is inline connector (#3837)[https://github.com/opensearch-project/ml-commons/pull/3837]
+* add validation for name and description for model model group and connector resources (#3805)[https://github.com/opensearch-project/ml-commons/pull/3805]
+* Don't convert schema-defined strings to other types during validation (#3761)[https://github.com/opensearch-project/ml-commons/pull/3761]
+
+
+### Maintenance
+* [Code Quality] Adding test cases for PlanExecuteReflect Agent (#3778)[https://github.com/opensearch-project/ml-commons/pull/3778]
+* Add Unit Tests for MCP feature (#3787)[https://github.com/opensearch-project/ml-commons/pull/3787]
+* exclude trusted connector check for hidden model (#3838)[https://github.com/opensearch-project/ml-commons/pull/3838]
+* add more logging to deploy/undeploy flows for better debugging (#3825)[https://github.com/opensearch-project/ml-commons/pull/3825]
+* remove libs folder (#3824)[https://github.com/opensearch-project/ml-commons/pull/3824]
+* Downgrade MCP version to 0.9 (#3821)[https://github.com/opensearch-project/ml-commons/pull/3821]
+* upgrade http client to version align with core (#3809)[https://github.com/opensearch-project/ml-commons/pull/3809]
+* Use stream optional enum set from core in MLStatsInput (#3648)[https://github.com/opensearch-project/ml-commons/pull/3648]
+* change SearchIndexTool arguments parsing logic (#3883)[https://github.com/opensearch-project/ml-commons/pull/3883]
+
+### Infrastructure
+* change release note (#3811)[https://github.com/opensearch-project/ml-commons/pull/3811]
+
+### Documentation
+* Replace the usage of elasticsearch with OpenSearch in README (#3876)[https://github.com/opensearch-project/ml-commons/pull/3876]
+* added blueprint for Bedrock Claude v4 (#3871)[https://github.com/opensearch-project/ml-commons/pull/3871]