> db.foo.ensureIndex({a:"text"})
> db.foo.getIndexes()
[
	{
		"v" : 1,
		"key" : {
			"_id" : 1
		},
		"ns" : "test.foo",
		"name" : "_id_"
	},
	{
		"v" : 0,
		"key" : {
			"_fts" : "text",
			"_ftsx" : 1
		},
		"ns" : "test.foo",
		"name" : "a_text",
		"weights" : {
			"a" : 1,
			"b" : 1
		},
		"default_language" : "english",
		"language_override" : "language"
	}
]
>