elastic & server start right, but mutation fail

yarn run v1.12.3
$ nodemon --watch 'src//*' -e ts,tsx --exec ts-node src/index.ts
[nodemon] 1.18.10
[nodemon] to restart at any time, enter rs
[nodemon] watching: src//*
[nodemon] starting ts-node src/index.ts
Elasticsearch INFO: 2019-02-19T11:22:16Z
Adding connection to http://localhost:9200/

Elasticsearch DEBUG: 2019-02-19T11:22:20Z
starting request {
"method": "HEAD",
"requestTimeout": 30000,
"castExists": true,
"path": "/",
"query": {}
}

Elasticsearch TRACE: 2019-02-19T11:22:20Z
-> HEAD http://localhost:9200/

<- 200

Elasticsearch DEBUG: 2019-02-19T11:22:20Z
Request complete

Server ready at http://localhost:3000/graphql