[7.x] [Alerting] Fixed bug with no possibility to edit the index name after adding (#64033)#64135

YulNaumenko merged 1 commit intoelastic:7.xelastic/kibana:7.xfrom

YulNaumenko:backport/7.x/pr-64033YulNaumenko/kibana:backport/7.x/pr-64033Copy head branch name to clipboard