var request = require('request');
//exports.httprequest = (requestData) =>{
function httprequest(requestData){
    return new Promise((resolve, reject)=>{
        var url = "http://xxx/_search"
        var option ={
          url: url,
          method: "POST",
          json: true,
          headers: {
              "content-type": "application/json",
          },
          body: requestData
        }
        request(option, function(error, response, body) {
          if (!error && response.statusCode == 200) {
              resolve(body)
          }
        });
    });
    
};

var data = {
  xxx
}
httprequest(data).then(function(req){
    console.log(req)
})