<select ng-model="compareFull[$parent.$index][$index].first"  ng-options="first.value as first.index for first in indexes | filter: filterList('value')"></select>

filter: filterList('value')

$scope.indexes = [
        {index:'$result', value:0},
        {index:'$result_etalon', value:1},
        {index:'$result_for_etalon', value:2},
        {index:'$hello', value:3},
        {index:'$hello_etalon', value:4},
        {index:'$hello_for_etalon', value:5},
    ];

$scope.filterList = function(prop){
        return function(item){
            if(item[prop]%3!=2){
                return item[prop];
            }
        }
    }