The option noMatches doesn’t appear anywhere in the source code.
The actual option is named noResults. The working version of your example is:
$('#search-select').select2({
...
"language": {
"noResults": function(){
return "No Results Found <a href="#" class="btn btn-danger">Use it anyway</a>";
}
},
escapeMarkup: function (markup) {
return markup;
}
});You also need to override escapeMarkup, so the button appears correctly, as per this issue.