[Backport 2.x] Fixed search monitor API to return alert counts.#990

AWSHurneyt merged 2 commits intoopensearch-project:2.xopensearch-project/alerting:2.xfrom

AWSHurneyt:2.x_pr984_backportAWSHurneyt/OpenSearch-Alerting:2.x_pr984_backportCopy head branch name to clipboard