MongoDB copy indexes

show-indexes.js

db.getCollectionNames().forEach(function(collection) {
indexes = db[collection].getIndexes();
indexes.forEach(function (c) {
  opt = '';
  ixkey = JSON.stringify(c.key, null, 1).replace(/(\r\n|\n|\r)/gm,"");
  ns = c.ns.substr(c.ns.indexOf(".") + 1, c.ns.length);
  for (var key in c) {
    if (key != 'key' && key != 'ns' && key != 'v') {
      if (opt != '') { opt+= ','}        
      if (c.hasOwnProperty(key)) {
        if (typeof(c[key]) == "string") {
          opt +=  (key + ': "' + c[key] + '"');
        } else  {
          opt+=  (key + ": " + c[key]);
        }
      }
    }
  }
  if (opt != '') { opt = '{' + opt + '}'}
  print ('db.' + ns + '.ensureIndex(' + ixkey + ','+  opt + ')');
})});