Add release notes for ODFE 1.9.0.0

release-notes/opendistro-for-elasticsearch-anomaly-detection.release-notes-1.9.0.0.md

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+## Version 1.9.0.0 Release Notes
+
+Compatible with Elasticsearch 7.8.0 and Open Distro for Elasticsearch 1.9.0
+
+## Enhancements
+
+- delete deprecated getFeatureSamplesForPeriods getPreviewFeatures (PR [#151](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/151))
+- remove deprecated getCurrentFeatures (PR [#152](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/152))
+- not update threshold with zero scores (PR [#157](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/157))
+- threshold model outputs zero grades instead of nan grades (PR [#158](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/158))
+- configure rcf with new minimum samples (PR [#160](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/160))
+- Rollover AD result index less frequently (PR [#168](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/168))
+- Use aggregation's default value if no docs (PR [#167](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/167))
+- Add setting for enabling/disabling circuit breaker (PR [#169](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/169))
+- Add result indices retention period (PR [#174](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/174))
+
+## Bug Fixes
+
+- Fix retrying saving anomaly results (PR [#154](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/154))
+
+## Infra Changes
+
+- Add breaking changes in release notes (PR [#145](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/145))
+- change rcf from local to maven (PR [#150](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/150))
+- Run tests on docker if docker image exists (PR [#165](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/165))
+- Add auto release drafter (PR [#178](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/178))
+
+## Version Upgrades
+
+- ODFE Release 1.8.1 (PR [#156](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/156))
+- Bump ES version to 7.8.0 (PR [#172](https://github.com/opendistro-for-elasticsearch/anomaly-detection/pull/172))