       data: { type: Schema.Types.Mixed }
     Awesome.plugin any_index, [
       { keys: { 'data.whatever_you_want': 1 }, options: { unique: true, sparse: true } }
+      { keys: { 'data.something_else': 1, 'data.second_key': 1 }, options: { unique: true } }
     ]
     @connection.model 'Awesome', Awesome
     setTimeout () =>

          safe: null
        ,
          v: 1
          key: { 'data.something_different': 1 }
          unique: true
          ns: 'test-any-index.awesomes'

          ns: 'test-any-index.awesomes'
          name: 'data.whatever_you_want_1'
          sparse: true
          background: true
          safe: null
        ,
          v: 1
          unique: true
          key: { 'data.something_else': 1, 'data.second_key': 1 }
          name: 'data.something_else_1_data.second_key_1'
          ns: 'test-any-index.awesomes'
          background: true
          safe: null
        ]
