Cant connect searchbox to local elasticsearch

these are my setting:
const appbaseClientConfig = {
url: "localhost:9200",
app: "imdb",
credentials: "",
};

it sends a request to : POST http://localhost:9200/imdb/_reactivesearch.v3

but elasticsearch local does not recognize /_reactivesearch.v3 endpoint and throws 500 error .
please tell me how to connect a local installation of elasticsearch . the proxy server provided by appbase doesnt work either.