Yajra Datatables global search not working with simple query

I am trying to implement yajra datatables in one of my laravel application and this is the first time I am using yajra datatables required for server side processing. My table is showing records but when I try to search from the tables it does not search here is the code I am using.

Controller

$prospects = Prospect::
            where('is_customer_of', NULL)
            ->where('type', 'Year-round')
            ->orWhere('type', NULL)
            ->orderBy('created_at', 'DESC')
            ->select('*');

    return Datatables::of($prospects)
                    ->editColumn('status', function($row) {
                        if ($row->status == 0) {
                            $html = '<span class="badge label-table badge-success">Untagged</span>';
                        } elseif ($row->status == 1) {
                            $html = '<span class="badge label-table badge-danger">Tagged</span>';
                        }
                        return $html;
                    })
                    ->addColumn('untagged_date', function($row) {
                        if (Auth::user()->role == 'admin') {
                            if (UntaggedLog::getUntaggedData($row->id)) {
                                return date("Y-m-d", strtotime(UntaggedLog::getUntaggedData($row->id)->created_at));
                            } else {
                                return '-';
                            }
                        }
                    })
                    ->addColumn('tagged_by', function($row) {
                        if ($row->tagged_by) {
                            $user = User::find($row->tagged_by)->name;
                            return $user;
                        } else {
                            return '-';
                        }
                    })
                    ->addColumn('date_last_called', function($row) {
                        $callLogs = CallLogs::where('prospect_id', $row->id)
                                ->orderBy('start_time', 'DESC')
                                ->get();
                        if (count($callLogs) > 0) {
                            return date('Y-m-d', strtotime(CallLogs::getLastCalledDate($row->id)));
                        } else {
                            return '-';
                        }
                    })
                    ->setRowAttr([
                        'data-href' => function ($row) {
                            return route('prospect-view', ['id' => $row->id, 'name' => $row->name]);
                        }])
                    ->rawColumns(['status', 'Date Untagged'])
                    ->make(true);

JS

$('#all_prospects_datatables').DataTable({
    "pageLength": 100,
    "lengthMenu": [[100, 500, 1000, -1], [100, 500, 1000, "All"]],
    processing: true,
    serverSide: true,
    responsive: true,
    bAutoWidth: false,
    ajax: '/getIndexData',
    "columnDefs": [
        {"searchable": true}
    ],
    columns: [
        {data: 'status', name: 'status'},
        {data: 'name', name: 'name'},
        {data: 'city', name: 'city'},
        {data: 'state', name: 'state'},
        {data: 'timezone', name: 'timezone'},
        {data: 'type', name: 'type'},
        {data: 'created_at', name: 'created_at'},
        {data: 'tagged_date', name: 'tagged_date'},
        {data: 'untagged_date', name: 'untagged_date'},
        {data: 'tagged_by', name: 'tagged_by'},
        {data: 'date_last_called', name: 'date_last_called'}
    ]

});

Any help / hint will be much appreciated as I am trying to figure out the issue for like a day now.

via Chebli Mohamed