release notes for 2.7.0 (#1537)

Signed-off-by: vamsi-amazon <[email protected]>

Author: vamsimanohar

release-notes/opensearch-sql.release-notes-2.7.0.0.md

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+Compatible with OpenSearch and OpenSearch Dashboards Version 2.7.0
+
+### Features
+
+* Create datasource API (#1458) ([#1479](https://github.com/opensearch-project/sql/pull/1479))
+* REST API for GET,PUT and DELETE ([#1502](https://github.com/opensearch-project/sql/pull/1502))
+
+### Enhancements
+
+* [main]Changes in DataSourceService and DataSourceMetadataStorage interface ([#1414](https://github.com/opensearch-project/sql/pull/1414))
+* Added SINH function to V2 engine ([#1437](https://github.com/opensearch-project/sql/pull/1437))
+* Added RINT function to V2 engine  ([#1439](https://github.com/opensearch-project/sql/pull/1439))
+* Add `sec_to_time` Function To OpenSearch SQL ([#1438](https://github.com/opensearch-project/sql/pull/1438))
+* Add `WEEKDAY` Function to SQL Plugin ([#1440](https://github.com/opensearch-project/sql/pull/1440))
+* Add `YEARWEEK` Function To OpenSearch SQL ([#1445](https://github.com/opensearch-project/sql/pull/1445))
+* Add `EXTRACT` Function To OpenSearch SQL Plugin ([#1443](https://github.com/opensearch-project/sql/pull/1443))
+* Add `STR_TO_DATE` Function To The SQL Plugin ([#1444](https://github.com/opensearch-project/sql/pull/1444))
+* Add The `TO_SECONDS` Function To The SQL Plugin ([#1447](https://github.com/opensearch-project/sql/pull/1447))
+* Added Arithmetic functions to V2 engine ([#1448](https://github.com/opensearch-project/sql/pull/1448))
+* Added SIGNUM function to V2 engine ([#1442](https://github.com/opensearch-project/sql/pull/1442))
+* Add `TIMESTAMPADD` Function To OpenSearch SQL Plugin ([#1453](https://github.com/opensearch-project/sql/pull/1453))
+* Add `Timestampdiff` Function To OpenSearch SQL ([#1472](https://github.com/opensearch-project/sql/pull/1472))
+* Add Nested Support in Select Clause (#1490) ([#1518](https://github.com/opensearch-project/sql/pull/1518))
+* Fix null response from pow/power and added missing integration testing ([#1459](https://github.com/opensearch-project/sql/pull/1459))
+
+
+### Bug Fixes
+
+* Integ Test Refactoring ([#1383](https://github.com/opensearch-project/sql/pull/1383))
+* Exclude OpenSearch system index when IT cleanup ([#1381](https://github.com/opensearch-project/sql/pull/1381))
+
+### Documentation
+
+* Documentation and other papercuts for datasource api launch ([#1534](https://github.com/opensearch-project/sql/pull/1534))
+
+### Maintenance
+
+* Refactor AWSSigV4 auth to support different AWSCredentialProviders ([#1389](https://github.com/opensearch-project/sql/pull/1389))
+* [AUTO] Increment version to 2.7.0-SNAPSHOT ([#1368](https://github.com/opensearch-project/sql/pull/1368))
+* Update usage of Strings.toString ([#1404](https://github.com/opensearch-project/sql/pull/1404))
+* Deprecated Spring IoC and using Guice instead (#1177) ([#1410](https://github.com/opensearch-project/sql/pull/1410))
+* Bump backport version. ([#1009](https://github.com/opensearch-project/sql/pull/1009))
+* Resolve table function based on StorageEngine provided function resolver ([#1424](https://github.com/opensearch-project/sql/pull/1424))
+* Rework on `OpenSearchDataType`: parse, store and use mapping information ([#1455](https://github.com/opensearch-project/sql/pull/1455))
+* Update to account for XContent refactor in 2.x ([#1485](https://github.com/opensearch-project/sql/pull/1485))
+* Replace non-ASCII characters in code and docs. ([#1486](https://github.com/opensearch-project/sql/pull/1486))
+* Add publish snapshots to maven via GHA ([#1496](https://github.com/opensearch-project/sql/pull/1496))
+* Refactoring datasource changes to a new module. ([#1511](https://github.com/opensearch-project/sql/pull/1511))
+* #639: allow metadata fields and score opensearch function  (#228) ([#1509](https://github.com/opensearch-project/sql/pull/1509))