Text indexes are created as v:0

> 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"

	}

]

>