yajra/laravel-datatables filterColumn doesnt work - laravel

Question

Page loading correctly and every things work fine while bringing datas. Now I want to filter them but FilterColumn() method doesnt even work. When I tried filter() method it's working but then I won't get $keywords variable. I am missing something while querying leads ?
if (request()->ajax()) {
$leads = Lead::with('country','agent','detail')->orderBy('id','DESC');
$leads->where(function($q) use ($user){
if ($user->hasRole('agent') && !$user->hasRole('admin') && !$user->hasRole('lead')){ //agent isem
$q->where('agent_id',$user->id)
->orWhere('agent_id',null);
}
});
return DataTables::of($leads)->
addColumn('edit_button', function ($lead) {
$link = route('leads.edit',$lead->id);
return ' Edit ';
})->
filterColumn('edit_button', function ($query, $keyword) {
dd($keyword);
return $query->whereHas('patient', function ($query) use ($keyword) {
$query->whereRaw("CONCAT( name, ' ', surname ) like ?", ["%$keyword%"]);
});
})->rawColumns(['edit_button','phone','detail.conversion_notes'])->
toJson();
}
$tableColumn = [
['data' => 'edit_button', 'name' => 'edit_button', 'title' => 'Edit', 'searchable' => false],
['data' => 'full_name', 'name' => 'full_name', 'title' => 'Full Name'],
['data' => 'phone', 'name' => 'phone', 'title' => 'Phone'],
['data' => 'email', 'name' => 'email', 'title' => 'Email'],
['data' => 'country.name', 'name' => 'country.name', 'title' => 'Country'],
['data' => 'agent.name', 'name' => 'agent.name', 'title' => 'Agent'],
['data' => 'treatment', 'name' => 'treatment', 'title' => 'Treatment'],
['data' => 'find_us', 'name' => 'find_us', 'title' => 'Find Us'],
['data' => 'form_type', 'name' => 'form_type', 'title' => 'Form','visible' => false],
['data' => 'social_account', 'name' => 'social_account', 'title' => 'Sosyal Medya'],
['data' => 'created_at', 'name' => 'created_at', 'title' => 'Created At'],
['data' => 'detail.conversion_notes', 'name' => 'detail.conversion_notes', 'title' => 'Primary Notes'],
];
$html = $builder->columns($tableColumn)->parameters([
"pageLength" => 25,
"lengthMenu" => [[10, 25, 50, 100, -1], [10, 25, 50, 100, "All"]],
'dom' => 'Bfrtip',
'columnDefs' => [
['width' => '2%', 'targets' => 0],
['width' => '7%', 'targets' => 1],
'buttons' => [
'pageLength',
[
'extend' => 'colvis',
'collectionLayout' => 'fixed two-column',
'columns' => ':not(.noVis)'
]
]
]);