STOPING elasticsearch.bat -NODE JS

i'm using node js child_process module to run the elasticsearch.bat as follows

const { spawn } = require('child_process');
var bat = require.resolve('C:/elasticsearch-7.0.1/bin/elasticsearch.bat');
var run = require.resolve('main.bat');
var ls = spawn(bat,{run});
ls.stdout.on('data', function (data) {
console.log('stdout: ' + data);
ls.stderr.on('data', function (data) {
console.log('stderr: ' + data);
ls.on('close', (code) => {
console.log(child process close all stdio with code ${code});
ls.on('exit', function (code) {
console.log('child process exited with code ' + code);
i wrote this code inside elasticsearch.js file

after the run i'm doing some other tasks end of all i need to close the terminal ...what is the way to do that ..i used "SIGINT" "SIGTERM" ..but not worked

flow of execution:
1.running main.bat
2.which will call main.js
3.from main.js calling the start() method of elasticsearch.js

Thanks in advance.

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