Generate release notes for 2.0.0

How to repeat:
* `git checkout origin/2.0`
* `git log --pretty=format:"* %s" --since=origin/1.x > release-notes/opensearch-security.release-notes-2.0.0.0-rc1.md`
* Manually organize file sections
  * Add Date / Version section (copy + modify from previous release)
  * Enhancements/Bug fixes/Maintenance
* Replace pull request ids with full urls via regex
  * Find: `\(#(\d+)\)$`
  * Replace: `([#$1](https://github.com/opensearch-project/security/pull/$1)`
* Commit with these steps / modified with additional details

Signed-off-by: Peter Nied <petern@amazon.com>

release-notes/opensearch-security.release-notes-2.0.0.0-rc1.md

@@ -0,0 +1,51 @@
+## 2022-04-20 Version 2.0.0.0-rc1
+
+Compatible with OpenSearch 2.0.0-rc1
+
+### Enhancements
+
+* Introduce dfm_empty_overrides_all setting to enable role without dls/fls to override roles with dls/fls ([#1735](https://github.com/opensearch-project/security/pull/1735)
+* Add depreciation notice to security tools ([#1756](https://github.com/opensearch-project/security/pull/1756)
+* [Practice] Reverting changes ([#1754](https://github.com/opensearch-project/security/pull/1754)
+* Renames securityconfig folder to config in bundle step and makes relevant changes ([#1749](https://github.com/opensearch-project/security/pull/1749)
+* Updated issue templates from .github. ([#1740](https://github.com/opensearch-project/security/pull/1740)
+* Updates Dev guide ([#1590](https://github.com/opensearch-project/security/pull/1590)
+* List out test failures in CI log ([#1737](https://github.com/opensearch-project/security/pull/1737)
+* Make Git ignore out/ directory ([#1734](https://github.com/opensearch-project/security/pull/1734)
+* Fix data-stream name resolution for wild-cards ([#1723](https://github.com/opensearch-project/security/pull/1723)
+* Remove support for JDK14 ([#1720](https://github.com/opensearch-project/security/pull/1720)
+* Speeding up tests ([#1715](https://github.com/opensearch-project/security/pull/1715)
+* Fix min_doc_count handling when using Document Level Security ([#1714](https://github.com/opensearch-project/security/pull/1714)
+* Set the mapped security roles of the user so these can be used by the DLS privileges evaluator. Allow security roles to be used for DLS parameter substitution. Fixes opensearch-project/security/#1568 ([#1588](https://github.com/opensearch-project/security/pull/1588)
+* Convert Plugin install to only build once ([#1708](https://github.com/opensearch-project/security/pull/1708)
+* Upgrade to Gradle 7 ([#1710](https://github.com/opensearch-project/security/pull/1710)
+* Move CodeQL into parallel workfow ([#1705](https://github.com/opensearch-project/security/pull/1705)
+* Seperate BWC tests into parallel workflow ([#1706](https://github.com/opensearch-project/security/pull/1706)
+* Fixes broken test due to unsupported EC using JDK-17 ([#1711](https://github.com/opensearch-project/security/pull/1711)
+* Centralize version settings ([#1702](https://github.com/opensearch-project/security/pull/1702)
+* Remove TransportClient auth/auth ([#1701](https://github.com/opensearch-project/security/pull/1701)
+* Add new code hygiene workflow ([#1699](https://github.com/opensearch-project/security/pull/1699)
+* Remove JDK8 from CI ([#1703](https://github.com/opensearch-project/security/pull/1703)
+* Add CI check for demo script ([#1690](https://github.com/opensearch-project/security/pull/1690)
+* Introduce BWC tests in security plugin ([#1685](https://github.com/opensearch-project/security/pull/1685)
+* Correct the step name in CI ([#1683](https://github.com/opensearch-project/security/pull/1683)
+* Add support for DLS Term Lookup Queries ([#1541](https://github.com/opensearch-project/security/pull/1541)
+
+### Bug fixes
+
+* Add signal/wait model for TestAuditlogImpl ([#1758](https://github.com/opensearch-project/security/pull/1758)
+* Switch to log4j logger ([#1751](https://github.com/opensearch-project/security/pull/1751)
+* Remove sleep when waiting for node closure ([#1722](https://github.com/opensearch-project/security/pull/1722)
+* Remove explictt dependency on jackson-databind ([#1709](https://github.com/opensearch-project/security/pull/1709)
+* Fix break thaat was missed during a merge ([#1707](https://github.com/opensearch-project/security/pull/1707)
+* Revert "Replace opensearch class names with opendistro class names during serialization and restore them back during deserialization (#1278)" ([#1691](https://github.com/opensearch-project/security/pull/1691)
+* Update to most recent verson of jackson-databind ([#1679](https://github.com/opensearch-project/security/pull/1679)
+* Fixed rest status for the replication action failure with DLS/FLS and ([#1677](https://github.com/opensearch-project/security/pull/1677)
+* Downgrade Gradle version ([#1661](https://github.com/opensearch-project/security/pull/1661)
+
+### Maintenance
+
+* Incremented version to 2.0-rc1. ([#1764](https://github.com/opensearch-project/security/pull/1764)
+* Upgrade to opensearch 2.0.0 alpha1 ([#1741](https://github.com/opensearch-project/security/pull/1741)
+* Upgrade to OpenSearch 2.0.0 ([#1698](https://github.com/opensearch-project/security/pull/1698)
+* Move to version 2.0.0.0 ([#1695](https://github.com/opensearch-project/security/pull/1695)