build_index.js

var lunr = require('lunr'),
    stdin = process.stdin,
    stdout = process.stdout,
    buffer = [];

stdin.resume();
stdin.setEncoding('utf8');

stdin.on('data', function (data) {
  buffer.push(data);
});

stdin.on('end', function () {
  var documents = JSON.parse(buffer.join(''))

  var idx = lunr(function () {
    this.ref('id')
    this.field('title', { boost: 10 })
    this.field('url')
    this.field('content')

    documents.forEach(function (doc) {
      this.add(doc)
    }, this)
  })

  stdout.write(JSON.stringify(idx))
});