Regarding elasticsearch and grafana configuration

Hi team,

I am trying to add elasticsearch data source in grafana. I have created few variables but data source is not configured successfully looks like. It is showing error

Elasticsearch error: request [/_msearch] contains unrecognized parameter: [auth_token]

I am using elasticsearch 7.4.2 and grafana version is Grafana v7.2.0-pre
What will be the cause and solution for this?