How to transform records count from Elasticsearch datasource

Hello. I have grafana v7.5.5. I need to create a panel which should use queries from 2 different Elasticsearch datasources. Each query returns only total amount of records. What I need is to divide first amount on second. How can I do this operation? I’m trying to use Transform tab of my panel - Add field from calculation - Binary operation and here do division, but it doesn’t work. Nothing happens with numbers.