Release notes for v2.18.0

Signed-off-by: sumukhswamy <[email protected]>

release-notes/opensearch-dashboards-search-relevance.release-notes-2.18.0.0.md

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+## Version 2.18.0.0 Release Notes
+
+Compatible with OpenSearch 2.18.0
+
+### Features
+* Navigate to import_sample_data app when navGroupEnabled ([#457](https://github.com/opensearch-project/dashboards-search-relevance/pull/457))
+
+### Bug Fixes
+* Changed path for error handling in APIs ([#459](https://github.com/opensearch-project/dashboards-search-relevance/pull/459))
+* Removed default option in MDS selector ([#454](https://github.com/opensearch-project/dashboards-search-relevance/pull/454))
+
+### Maintenance
+* Bumping actions/upload-artifact ([#450](https://github.com/opensearch-project/dashboards-search-relevance/pull/450))
+
+## New Contributors
+* @Hailong-am made their first contribution in ([#449](https://github.com/opensearch-project/dashboards-search-relevance/pull/449))