Building up an Elasticsearch query in JS

es-search.js

const secondThing = { term: { field2: 'bar' } };
const firstThing = { term: { field1: 'foo' } };
const filter = [ firstThing, secondThing ];
const bool = { filter };
const query = { bool };
const body = { query };
const params = {
  index: 'your-index',
  body
};
const result = await es.search(params);