Added release notes for 1.4.0 (#1398)

* Added release notes for 1.4.0

Signed-off-by: Asif Sohail Mohammed <[email protected]>

Author: asifsmohammed

Diff for: release/release-notes/data-prepper.release-notes-1.4.0.md

@@ -0,0 +1,36 @@
+## 2022-05-13 Version 1.4.0
+
+---
+
+### Features
+* Support metrics ingestion ([#1154](https://github.com/opensearch-project/data-prepper/pull/1154), [#1271](https://github.com/opensearch-project/data-prepper/pull/1271))
+
+### Enhancements
+* Migrate Trace Analytics plugins to Event Model ([#1216](https://github.com/opensearch-project/data-prepper/pull/1216), [#1223](https://github.com/opensearch-project/data-prepper/pull/1223), [#1224](https://github.com/opensearch-project/data-prepper/pull/1224), [#1220](https://github.com/opensearch-project/data-prepper/pull/1220), [#1237](https://github.com/opensearch-project/data-prepper/pull/1237), [#1241](https://github.com/opensearch-project/data-prepper/pull/1241), [#1239](https://github.com/opensearch-project/data-prepper/pull/1241))
+* Support for OpenSearch 2.0 (previously supported versions of OpenSearch and OpenDistro are still supported)
+
+### Infrastructure
+* Added needs-documentation label ([#1373](https://github.com/opensearch-project/data-prepper/pull/1373))
+* Upload and publish JUnit test reports for some tests ([#1336](https://github.com/opensearch-project/data-prepper/pull/1336))
+
+### Documentation
+* Performance tests documentation ([#1309](https://github.com/opensearch-project/data-prepper/pull/1309))
+* Added custom metrics in otel-trace-source ([#1246](https://github.com/opensearch-project/data-prepper/pull/1246))
+
+### Maintenance
+* Update to use opensearch-java client instead of Rest High Level Client for bulk requests. ([#1381](https://github.com/opensearch-project/data-prepper/pull/1381))
+* OpenSearch build files clean-up ([#1315](https://github.com/opensearch-project/data-prepper/pull/1315))
+* Set 30 minute timeout to release process GitHub actions ([#1392](https://github.com/opensearch-project/data-prepper/pull/1392))
+* Updated Gradle to 7.4.2 ([#1377](https://github.com/opensearch-project/data-prepper/pull/1377))
+* Fix file uploads to S3 with Gradle 7 ([#1383](https://github.com/opensearch-project/data-prepper/pull/1383))
+* Updated README links ([#1376](https://github.com/opensearch-project/data-prepper/pull/1376))
+* Fix link to NOTICE file ([#1268](https://github.com/opensearch-project/data-prepper/pull/1268))
+* Run OpenSearch sink integration tests against more versions of OpenDistro ([#1348](https://github.com/opensearch-project/data-prepper/pull/1348))
+* Updated Mockito in OpenSearch plugin ([#1339](https://github.com/opensearch-project/data-prepper/pull/1339))
+* Removed OpenSearch build-tools gradle plugin from OpenSearch plugin ([#1327](https://github.com/opensearch-project/data-prepper/pull/1327))
+* Use complete url for processor READMEs ([#1324](https://github.com/opensearch-project/data-prepper/pull/1324))
+
+### Refactoring
+* Made the BulkRetryStrategyTests less reliant on implementation specifics from OpenSearch ([#1346](https://github.com/opensearch-project/data-prepper/pull/1346))
+* Decouple OpenSearchSinkIT from OpenSearch Core test cases ([#1325](https://github.com/opensearch-project/data-prepper/pull/1325))
+* Use MatcherAssert.assertThat in OpenSearchSinkIT ([#1323](https://github.com/opensearch-project/data-prepper/pull/1323))