title: How to make use of async.applyEachSeries in node js?
body: <p>Much appreciated if someone can give a more concrete example of how to use the async.applyEachSeries function.</p>
  
  <pre><code>async.applyEach([enableSearch, updateSchema], 'bucket', callback);
  
  // partial application example:
  async.each(
      buckets,
      async.applyEach([enableSearch, updateSchema]),
      callback
  );
  </code></pre>
  
  <p>This is from the async readme documentation, but I have no idea how to use it. What is the 'bucket', is it just a string being passed to somewhere?</p>