how to solve - “too many text index for ..” - mongodb error?

问题

Getting this error and don't know why, here is the snippet of the function that deals with mongodb full-text search:

...
db.collection.ensureIndex({ description: 'text' }, { name: 'TextIndex' });

db.collection.runCommand('text', { search: 'my query' }, function (err, res) {
   console.log(res); 
  // { 
  //   "message": "failed to search items for user by query", 
  //   "error": "too many text index for: .. 
  // }
});

The same problem appears in mongo shell as well..

来源：https://stackoverflow.com/questions/18385853/how-to-solve-too-many-text-index-for-mongodb-error