Amazon API Gateway + Lambda + CloudSearchで検索APIサービスを作ってみる ref: http://qiita.com/horike37/items/3e37ff6416f6cf2a7934

file0.js

var aws = require('aws-sdk');

var cloudsearchdomain = new aws.CloudSearchDomain({
  endpoint: '<CloudSearchのエンドポイント>'
});

exports.handler = function(event, context) {
    var params = {
                    query:event.q
                };
    cloudsearchdomain.search(params, function(err, data) {
        if (err) {
            console.log("error  " + err);
        } else {
            if (data.hits.found > 0) {
                console.log(data.hits.hit[0]);
                context.done(null,  data.hits.hit[0]);
            } else {
                console.log('not found');
                context.done(null, 'error');
            }
        }
    });
};