[Backport 2.17] update number of replicas of system indices to 1-20 and number of primary shards for system indices to 1 #836

	##
	# Copyright OpenSearch Contributors
	# SPDX-License-Identifier: Apache-2.0
	##

	name: Delete merged branch of the backport PRs
	on:
	pull_request:
	types:
	- closed

	jobs:
	delete-branch:
	runs-on: ubuntu-latest
	if: startsWith(github.event.pull_request.head.ref,'backport/')
	steps:
	- name: Delete merged branch
	uses: SvanBoxel/delete-merged-branch@main
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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