grails-documentation-mongodb/src/docs/guide/3.7 Full Text Search.gdoc

Using MongoDB 2.6 and above you can create [full text search|http://docs.mongodb.org/manual/reference/operator/query/text/#op._S_text] indices.

To create a "text" index using the @index@ method inside the @mapping@ block:

{code}
class Product {
    ObjectId id
    String title

    static mapping = {
        index title:"text"
    }
}
{code}

You can then search for instances using the @search@ method:

{code}
assert Product.search("bake coffee cake").size() == 10
assert Product.search("bake coffee -cake").size() == 6
{code}

You can search for the top results by rank using the @searchTop@ method:

{code}
assert Product.searchTop("cake").size() == 4
assert Product.searchTop("cake",3).size() == 3
{code}

And count the number of hits with the @countHits@ method:

{code}
assert Product.countHits('coffee') == 5
{code}