add release notes for 1.3.20 #49

	name: Multi-node Test Workflow
	# This workflow is triggered on pull requests and pushes to main or an OpenSearch release branch
	on:
	pull_request:
	branches:
	- "*"
	push:
	branches:
	- "*"

	jobs:
	build:
	strategy:
	matrix:
	java: [ 11 ]
	# Job name
	name: Build and test Alerting
	# This job runs on Linux
	runs-on: ubuntu-latest
	steps:
	# This step uses the setup-java Github action: https://github.com/actions/setup-java
	- name: Set Up JDK ${{ matrix.java }}
	uses: actions/setup-java@v1
	with:
	java-version: ${{ matrix.java }}
	# This step uses the checkout Github action: https://github.com/actions/checkout
	- name: Checkout Branch
	uses: actions/checkout@v2
	- name: Run integration tests with multi node config
	run: ./gradlew integTest -PnumNodes=3

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