MongoDB がレコードを検索するのに時間がかかりすぎる場合はどうすればよいでしょうか?

db.yourCollectionName.createIndex({yourFieldName:1});

> db.takeLessTimeToSearchDemo.createIndex({"EmployeeName":1});
{
   "createdCollectionAutomatically" : true,
   "numIndexesBefore" : 1,
   "numIndexesAfter" : 2,
   "ok" : 1
}

> db.takeLessTimeToSearchDemo1.createIndex({"EmployeeName":"text"});
{
   "createdCollectionAutomatically" : true,
   "numIndexesBefore" : 1,
   "numIndexesAfter" : 2,
   "ok" : 1
}

> db.takeLessTimeToSearchDemo2.createIndex({"EmployeeName":"hashed"});
{
   "createdCollectionAutomatically" : true,
   "numIndexesBefore" : 1,
   "numIndexesAfter" : 2,
   "ok" : 1
}