Steps to reproduce

1. Start the apollo gql server with yarn start
2. Open a new terminal and run yarn start-mesh
3. A new browser tab should open the GraphiQL Editor on port 4001
4. Use the following query

mutation Test {
  A: changeName(name: "A")
  B: changeName(name: "B")
  C: changeName(name: "C")
  D: changeName(name: "D")
}

5. Go to the terminal output of the apollo gql server and check the req.body. There are 4 requests instead of 1.

Expected behavior

The apollo gql server, which is a handler of the GQL Mesh, receives 1 request with all mutations inside of it.

Reason why it does not work

The default graphql-js execute function calls executeFieldsSerially which breaks down the concept behind the batch-executor of graphql-tools

https://github.com/graphql/graphql-js/blob/main/src/execution/execute.ts#L379

https://www.graphql-tools.com/docs/batch-execution#batch-the-executor