I'm using elastic-app-search REST API to create engine and add it in a meta engine

const axios = require("axios")
const private_key = process.env.elastic_private_key
const search_key = process.env.elastic_search_key

    async addSourceEng(metaName, source_engine) {

        try {
            const response = await axios.patch(process.env.elastic_url, {
                "name": metaName,
                "source_engines":[source_engine]
            }, {
                headers: {
                    Authorization: `Bearer ${private_key}`,
                },
            });
            return data
        } catch (error) {
            console.log(error);
            return error
        }


    }

I'm using npm package @elastic/app-search-node I've successfully created the engine but can't add it in meta.